[Mgs] Mgs Digest, Vol 195, Issue 1
Eric Russell
ejrussell61 at gmail.com
Tue Aug 1 12:10:52 MDT 2023
I believe a tach (short for tachometer) and rev counter refer to the same
instrument.
And, yes, all MGAs came with a tach as original equipment.
EjR
On Tue, Aug 1, 2023 at 2:04 PM <mgs-request at autox.team.net> wrote:
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> Today's Topics:
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> 1. Re: Mgs Digest, Vol 194, Issue 12 (Eric Russell)
> 2. Re: Mgs Digest, Vol 194, Issue 12 (Paul Hunt)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 31 Jul 2023 16:21:38 -0400
> From: Eric Russell <ejrussell61 at gmail.com>
> To: mgs at autox.team.net
> Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12
> Message-ID:
> <
> CAP7dBXCk4hzrb9Sj+Ptrny-d40Pms5jk5jhttjOVnATrLE5eNA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> My guess is an MGA tach face (Jaeger) or perhaps MGA tach face & case was
> used with a different tach's internals. MGB tachs were 'Smiths'.
>
> MGB tach for MGA is described here:
> http://mgaguru.com/mgtech/electric/et202c.htm
>
> EjR
>
> On Mon, Jul 31, 2023 at 2:08?PM <mgs-request at autox.team.net> wrote:
>
> > Send Mgs mailing list submissions to
> > mgs at autox.team.net
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://autox.team.net/mailman/listinfo/mgs
> > or, via email, send a message with subject or body 'help' to
> > mgs-request at autox.team.net
> >
> > You can reach the person managing the list at
> > mgs-owner at autox.team.net
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Mgs digest..."
> >
> >
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> >
> > Today's Topics:
> >
> > 1. mga 1500 with early 5 main mgb engine (dave northrup)
> > 2. Re: mga 1500 with early 5 main mgb engine (Max Heim)
> > 3. Re: mga 1500 with early 5 main mgb engine (Paul Hunt)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Mon, 31 Jul 2023 00:22:55 +0000
> > From: dave northrup <dave at ranteer.com>
> > To: "mgs at autox.team.net" <mgs at autox.team.net>
> > Subject: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <8ba46f6ebee14b168b5e753f84b72499 at ranteer.com>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Negative ground, car runs smoothly, need to install the electric tach
> > which supposedly was previously installed in this car and working.
> >
> > On the back view, what hooks up where? I am pretty sure the tab, and the
> > screw, are ground.
> >
> > The other two - one needs to go to power and the other to the coil. I
> > think one is a female bullet connector; the other is male. Which goes to
> > power and which to the coil?
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0001.htm
> > >
> > -------------- next part --------------
> > A non-text attachment was scrubbed...
> > Name: tach front view.jpg
> > Type: image/jpeg
> > Size: 827772 bytes
> > Desc: tach front view.jpg
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0002.jpg
> > >
> > -------------- next part --------------
> > A non-text attachment was scrubbed...
> > Name: tach rear view.jpg
> > Type: image/jpeg
> > Size: 826250 bytes
> > Desc: tach rear view.jpg
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0003.jpg
> > >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Sun, 30 Jul 2023 17:52:40 -0700
> > From: Max Heim <mvheim at sonic.net>
> > To: "mgs at autox.team.net" <mgs at autox.team.net>
> > Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <983CC3D7-127F-4FD9-97E0-7533897C6FFD at sonic.net>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Hmm, the back of that tach case has obviously been modified. Are you sure
> > it still contains the matching internals? I say this because for 20
> years I
> > ran my Mk. I MGB with the original tach case, faceplate & needle, but
> with
> > a cheap auto parts store mini-tach inside the case. The only
> modifications
> > were two small screw holes to attach the mechanism.
> >
> > An original MGB Mk. I tach would have had a loop in the white wire,
> > attached to the back of the case with a thumb nut and a thin U-shaped
> brass
> > bracket. I am not seeing that on yours.
> >
> > Actually, I guess it is unclear whether you are talking about an MGA tach
> > or an early MGB tach...
> >
> > --
> > Max Heim
> > '66 MGB
> >
> > > On Jul 30, 2023, at 5:22 PM, dave northrup <dave at ranteer.com> wrote:
> > >
> > > Negative ground, car runs smoothly, need to install the electric tach
> > which supposedly was previously installed in this car and working.
> > >
> > > On the back view, what hooks up where? I am pretty sure the tab, and
> > the screw, are ground.
> > >
> > > The other two ? one needs to go to power and the other to the coil. I
> > think one is a female bullet connector; the other is male. Which goes to
> > power and which to the coil?
> > > <tach front view.jpg><tach rear
> > view.jpg>_______________________________________________
> > >
> > > Mgs at autox.team.net <mailto:Mgs at autox.team.net>
> > > Donate: http://www.team.net/donate.html <
> http://www.team.net/donate.html
> > >
> > > Suggested annual donation $12.75
> > >
> > > Archive: http://www.team.net/pipermail/mgs <
> > http://www.team.net/pipermail/mgs> http://autox.team.net/archive <
> > http://autox.team.net/archive>
> > >
> > > Unsubscribe:
> http://autox.team.net/mailman/options/mgs/mvheim@sonic.net
> > <http://autox.team.net/mailman/options/mgs/mvheim@sonic.net>
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230730/c68decc6/attachment-0001.htm
> > >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Mon, 31 Jul 2023 08:38:26 +0100
> > From: Paul Hunt <paulbhunt73 at gmail.com>
> > To: mgs at autox.team.net
> > Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <86e97849-ea66-aad1-c9f9-0556feb82fb0 at gmail.com>
> > Content-Type: text/plain; charset="utf-8"; Format="flowed"
> >
> > Not an MGB reference number, it looks like it has later internals than
> > but would still be the current-operated type i.e. RVI where the power to
> > the coil comes via the tach.? The ignition switch would be connected to
> > the male bullet and the female bullet to the coil.? 12v (also from the
> > ignition) to the spade and earth to the case.? When used on the MGB
> > there were separate wires from the ignition switch to the spade and to
> > the male bullet but you can tee from one to the other rather than
> > running a separate wire.
> >
> > It would have been helpful to see the top half of the dial where it
> > might have shown RVI and what polarity it was.? I suspect it would show
> > positive earth, but those electronics would have been used with negative
> > earth in an MGB for example so it looks like it has been converted by
> > swapping the guts instead of swapping the wires round internally.? If
> > that tach was used after the car was converted to negative earth it
> > would make sense.
> >
> > PaulH.
> >
> > On 31/07/2023 01:22, dave northrup wrote:
> > >
> > > Negative ground, car runs smoothly, need to install the electric tach
> > > which supposedly was previously installed in this car and working.
> > >
> > > On the back view, what hooks up where?? I am pretty sure the tab, and
> > > the screw, are ground.
> > >
> > > The other two ? one needs to go to power and the other to the coil.? I
> > > think one is a female bullet connector; the other is male.? Which goes
> > > to power and which to the coil?
> > >
> > >
> > > _______________________________________________
> > >
> > > Mgs at autox.team.net
> > > Donate:http://www.team.net/donate.html
> > > Suggested annual donation $12.75
> > >
> > > Archive:http://www.team.net/pipermail/mgs
> http://autox.team.net/archive
> > >
> > > Unsubscribe:
> > http://autox.team.net/mailman/options/mgs/paulbhunt73@gmail.com
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/0ad7ea29/attachment-0001.htm
> > >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
> > _______________________________________________
> > Mgs mailing list
> > Mgs at autox.team.net
> > http://autox.team.net/mailman/listinfo/mgs
> >
> >
> > ------------------------------
> >
> > End of Mgs Digest, Vol 194, Issue 12
> > ************************************
> >
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> http://autox.team.net/pipermail/mgs/attachments/20230731/144c49a7/attachment-0001.htm
> >
>
> ------------------------------
>
> Message: 2
> Date: Tue, 1 Aug 2023 08:13:10 +0100
> From: Paul Hunt <paulbhunt73 at gmail.com>
> To: mgs at autox.team.net
> Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12
> Message-ID: <6c64e1d7-8d4b-bc1b-1ace-c98016e66b29 at gmail.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Did any MGAs leave the factory with a tach?? Early MGBs had a rev
> counter before they got the tach.
>
> On 31/07/2023 21:21, Eric Russell wrote:
> > My guess is an MGA tach face (Jaeger) or perhaps MGA tach face & case
> > was used with a different tach's internals. MGB tachs were 'Smiths'.
> >
> > MGB tach for MGA is described here:
> > http://mgaguru.com/mgtech/electric/et202c.htm
> >
> > EjR
> >
> > On Mon, Jul 31, 2023 at 2:08?PM <mgs-request at autox.team.net> wrote:
> >
> > Send Mgs mailing list submissions to
> > mgs at autox.team.net
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://autox.team.net/mailman/listinfo/mgs
> > or, via email, send a message with subject or body 'help' to
> > mgs-request at autox.team.net
> >
> > You can reach the person managing the list at
> > mgs-owner at autox.team.net
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Mgs digest..."
> >
> >
> > Donate: http://www.team.net/donate.html
> > Suggested annual donation? $12.75
> > Archive: http://www.team.net/archive
> > Forums: http://www.team.net/forums
> >
> >
> >
> > Today's Topics:
> >
> > ? ?1. mga 1500 with early 5 main mgb engine (dave northrup)
> > ? ?2. Re: mga 1500 with early 5 main mgb engine (Max Heim)
> > ? ?3. Re: mga 1500 with early 5 main mgb engine (Paul Hunt)
> >
> >
> >
> ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Mon, 31 Jul 2023 00:22:55 +0000
> > From: dave northrup <dave at ranteer.com>
> > To: "mgs at autox.team.net" <mgs at autox.team.net>
> > Subject: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <8ba46f6ebee14b168b5e753f84b72499 at ranteer.com>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Negative ground, car runs smoothly, need to install the electric
> > tach which supposedly was previously installed in this car and
> > working.
> >
> > On the back view, what hooks up where?? I am pretty sure the tab,
> > and the screw, are ground.
> >
> > The other two - one needs to go to power and the other to the
> > coil.? I think one is a female bullet connector; the other is
> > male.? Which goes to power and which to the coil?
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL:
> > <
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0001.htm
> >
> > -------------- next part --------------
> > A non-text attachment was scrubbed...
> > Name: tach front view.jpg
> > Type: image/jpeg
> > Size: 827772 bytes
> > Desc: tach front view.jpg
> > URL:
> > <
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0002.jpg
> >
> > -------------- next part --------------
> > A non-text attachment was scrubbed...
> > Name: tach rear view.jpg
> > Type: image/jpeg
> > Size: 826250 bytes
> > Desc: tach rear view.jpg
> > URL:
> > <
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0003.jpg
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Sun, 30 Jul 2023 17:52:40 -0700
> > From: Max Heim <mvheim at sonic.net>
> > To: "mgs at autox.team.net" <mgs at autox.team.net>
> > Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <983CC3D7-127F-4FD9-97E0-7533897C6FFD at sonic.net>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Hmm, the back of that tach case has obviously been modified. Are
> > you sure it still contains the matching internals? I say this
> > because for 20 years I ran my Mk. I MGB with the original tach
> > case, faceplate & needle, but with a cheap auto parts store
> > mini-tach inside the case. The only modifications were two small
> > screw holes to attach the mechanism.
> >
> > An original MGB Mk. I tach would have had a loop in the white
> > wire, attached to the back of the case with a thumb nut and a thin
> > U-shaped brass bracket. I am not seeing that on yours.
> >
> > Actually, I guess it is unclear whether you are talking about an
> > MGA tach or an early MGB tach...
> >
> > --
> > Max Heim
> > '66 MGB
> >
> > > On Jul 30, 2023, at 5:22 PM, dave northrup <dave at ranteer.com>
> wrote:
> > >
> > > Negative ground, car runs smoothly, need to install the electric
> > tach which supposedly was previously installed in this car and
> > working.
> > >
> > > On the back view, what hooks up where?? I am pretty sure the
> > tab, and the screw, are ground.
> > >
> > > The other two ? one needs to go to power and the other to the
> > coil.? I think one is a female bullet connector; the other is
> > male.? Which goes to power and which to the coil?
> > > <tach front view.jpg><tach rear
> > view.jpg>_______________________________________________
> > >
> > > Mgs at autox.team.net <mailto:Mgs at autox.team.net>
> > > Donate: http://www.team.net/donate.html
> > <http://www.team.net/donate.html>
> > > Suggested annual donation? $12.75
> > >
> > > Archive: http://www.team.net/pipermail/mgs
> > <http://www.team.net/pipermail/mgs> http://autox.team.net/archive
> > <http://autox.team.net/archive>
> > >
> > > Unsubscribe:
> > http://autox.team.net/mailman/options/mgs/mvheim@sonic.net
> > <http://autox.team.net/mailman/options/mgs/mvheim@sonic.net>
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL:
> > <
> http://autox.team.net/pipermail/mgs/attachments/20230730/c68decc6/attachment-0001.htm
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Mon, 31 Jul 2023 08:38:26 +0100
> > From: Paul Hunt <paulbhunt73 at gmail.com>
> > To: mgs at autox.team.net
> > Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <86e97849-ea66-aad1-c9f9-0556feb82fb0 at gmail.com>
> > Content-Type: text/plain; charset="utf-8"; Format="flowed"
> >
> > Not an MGB reference number, it looks like it has later internals
> > than
> > but would still be the current-operated type i.e. RVI where the
> > power to
> > the coil comes via the tach.? The ignition switch would be
> > connected to
> > the male bullet and the female bullet to the coil.? 12v (also from
> > the
> > ignition) to the spade and earth to the case.? When used on the MGB
> > there were separate wires from the ignition switch to the spade
> > and to
> > the male bullet but you can tee from one to the other rather than
> > running a separate wire.
> >
> > It would have been helpful to see the top half of the dial where it
> > might have shown RVI and what polarity it was.? I suspect it would
> > show
> > positive earth, but those electronics would have been used with
> > negative
> > earth in an MGB for example so it looks like it has been converted by
> > swapping the guts instead of swapping the wires round internally.? If
> > that tach was used after the car was converted to negative earth it
> > would make sense.
> >
> > PaulH.
> >
> > On 31/07/2023 01:22, dave northrup wrote:
> > >
> > > Negative ground, car runs smoothly, need to install the electric
> > tach
> > > which supposedly was previously installed in this car and working.
> > >
> > > On the back view, what hooks up where?? I am pretty sure the
> > tab, and
> > > the screw, are ground.
> > >
> > > The other two ? one needs to go to power and the other to the
> > coil.? I
> > > think one is a female bullet connector; the other is male.?
> > Which goes
> > > to power and which to the coil?
> > >
> > >
> > > _______________________________________________
> > >
> > > Mgs at autox.team.net
> > > Donate:http://www.team.net/donate.html
> > > Suggested annual donation? $12.75
> > >
> > > Archive:http://www.team.net/pipermail/mgs
> > http://autox.team.net/archive
> > >
> > >
> > Unsubscribe:
> http://autox.team.net/mailman/options/mgs/paulbhunt73@gmail.com
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL:
> > <
> http://autox.team.net/pipermail/mgs/attachments/20230731/0ad7ea29/attachment-0001.htm
> >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
> > _______________________________________________
> > Mgs mailing list
> > Mgs at autox.team.net
> > http://autox.team.net/mailman/listinfo/mgs
> >
> >
> > ------------------------------
> >
> > End of Mgs Digest, Vol 194, Issue 12
> > ************************************
> >
> >
> > _______________________________________________
> >
> > Mgs at autox.team.net
> > Donate:http://www.team.net/donate.html
> > Suggested annual donation $12.75
> >
> > Archive:http://www.team.net/pipermail/mgs http://autox.team.net/archive
> >
> > Unsubscribe:
> http://autox.team.net/mailman/options/mgs/paulbhunt73@gmail.com
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>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Mgs mailing list
> Mgs at autox.team.net
> http://autox.team.net/mailman/listinfo/mgs
>
>
> ------------------------------
>
> End of Mgs Digest, Vol 195, Issue 1
> ***********************************
>
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