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<p>Did any MGAs leave the factory with a tach? Early MGBs had a rev
counter before they got the tach.<br>
</p>
<div class="moz-cite-prefix">On 31/07/2023 21:21, Eric Russell
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAP7dBXCk4hzrb9Sj+Ptrny-d40Pms5jk5jhttjOVnATrLE5eNA@mail.gmail.com">
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<div class="gmail_default" style="font-size:large">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'. </div>
<div class="gmail_default" style="font-size:large"><br>
</div>
<div class="gmail_default" style="font-size:large">MGB tach for
MGA is described here: <a
href="http://mgaguru.com/mgtech/electric/et202c.htm"
moz-do-not-send="true" class="moz-txt-link-freetext">http://mgaguru.com/mgtech/electric/et202c.htm</a> </div>
<div class="gmail_default" style="font-size:large"><br>
</div>
<div class="gmail_default" style="font-size:large">EjR </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Jul 31, 2023 at
2:08 PM <<a href="mailto:mgs-request@autox.team.net"
moz-do-not-send="true" class="moz-txt-link-freetext">mgs-request@autox.team.net</a>>
wrote:<br>
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Today's Topics:<br>
<br>
1. mga 1500 with early 5 main mgb engine (dave northrup)<br>
2. Re: mga 1500 with early 5 main mgb engine (Max Heim)<br>
3. Re: mga 1500 with early 5 main mgb engine (Paul Hunt)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 31 Jul 2023 00:22:55 +0000<br>
From: dave northrup <<a href="mailto:dave@ranteer.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">dave@ranteer.com</a>><br>
To: "<a href="mailto:mgs@autox.team.net" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">mgs@autox.team.net</a>"
<<a href="mailto:mgs@autox.team.net" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">mgs@autox.team.net</a>><br>
Subject: [Mgs] mga 1500 with early 5 main mgb engine<br>
Message-ID: <<a
href="mailto:8ba46f6ebee14b168b5e753f84b72499@ranteer.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">8ba46f6ebee14b168b5e753f84b72499@ranteer.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Negative ground, car runs smoothly, need to install the
electric tach which supposedly was previously installed in
this car and working.<br>
<br>
On the back view, what hooks up where? I am pretty sure the
tab, and the screw, are ground.<br>
<br>
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?<br>
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------------------------------<br>
<br>
Message: 2<br>
Date: Sun, 30 Jul 2023 17:52:40 -0700<br>
From: Max Heim <<a href="mailto:mvheim@sonic.net"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">mvheim@sonic.net</a>><br>
To: "<a href="mailto:mgs@autox.team.net" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">mgs@autox.team.net</a>"
<<a href="mailto:mgs@autox.team.net" target="_blank"
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Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
Message-ID: <<a
href="mailto:983CC3D7-127F-4FD9-97E0-7533897C6FFD@sonic.net"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">983CC3D7-127F-4FD9-97E0-7533897C6FFD@sonic.net</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
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.<br>
<br>
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.<br>
<br>
Actually, I guess it is unclear whether you are talking about
an MGA tach or an early MGB tach...<br>
<br>
--<br>
Max Heim<br>
'66 MGB<br>
<br>
> On Jul 30, 2023, at 5:22 PM, dave northrup <<a
href="mailto:dave@ranteer.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">dave@ranteer.com</a>>
wrote:<br>
> <br>
> Negative ground, car runs smoothly, need to install the
electric tach which supposedly was previously installed in
this car and working.<br>
> <br>
> On the back view, what hooks up where? I am pretty sure
the tab, and the screw, are ground.<br>
> <br>
> 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?<br>
> <tach front view.jpg><tach rear
view.jpg>_______________________________________________<br>
> <br>
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moz-do-not-send="true" class="moz-txt-link-freetext">Mgs@autox.team.net</a>
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------------------------------<br>
<br>
Message: 3<br>
Date: Mon, 31 Jul 2023 08:38:26 +0100<br>
From: Paul Hunt <<a href="mailto:paulbhunt73@gmail.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">paulbhunt73@gmail.com</a>><br>
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Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
Message-ID: <<a
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<br>
Not an MGB reference number, it looks like it has later
internals than <br>
but would still be the current-operated type i.e. RVI where
the power to <br>
the coil comes via the tach.? The ignition switch would be
connected to <br>
the male bullet and the female bullet to the coil.? 12v (also
from the <br>
ignition) to the spade and earth to the case.? When used on
the MGB <br>
there were separate wires from the ignition switch to the
spade and to <br>
the male bullet but you can tee from one to the other rather
than <br>
running a separate wire.<br>
<br>
It would have been helpful to see the top half of the dial
where it <br>
might have shown RVI and what polarity it was.? I suspect it
would show <br>
positive earth, but those electronics would have been used
with negative <br>
earth in an MGB for example so it looks like it has been
converted by <br>
swapping the guts instead of swapping the wires round
internally.? If <br>
that tach was used after the car was converted to negative
earth it <br>
would make sense.<br>
<br>
PaulH.<br>
<br>
On 31/07/2023 01:22, dave northrup wrote:<br>
><br>
> Negative ground, car runs smoothly, need to install the
electric tach <br>
> which supposedly was previously installed in this car and
working.<br>
><br>
> On the back view, what hooks up where?? I am pretty sure
the tab, and <br>
> the screw, are ground.<br>
><br>
> The other two ? one needs to go to power and the other to
the coil.? I <br>
> think one is a female bullet connector; the other is
male.? Which goes <br>
> to power and which to the coil?<br>
><br>
><br>
> _______________________________________________<br>
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