[Mgs] Mgs Digest, Vol 194, Issue 12

Mon Jul 31 14:21:38 MDT 2023

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:

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> Today's Topics:
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>    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?
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> ------------------------------
>
> 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>
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> ------------------------------
>
> 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
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> >
> > Unsubscribe:
> http://autox.team.net/mailman/options/mgs/paulbhunt73@gmail.com
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> End of Mgs Digest, Vol 194, Issue 12
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