<div dir="ltr"><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">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">mgs-request@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send Mgs mailing list submissions to<br>
<a href="mailto:mgs@autox.team.net" target="_blank">mgs@autox.team.net</a><br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<a href="http://autox.team.net/mailman/listinfo/mgs" rel="noreferrer" target="_blank">http://autox.team.net/mailman/listinfo/mgs</a><br>
or, via email, send a message with subject or body 'help' to<br>
<a href="mailto:mgs-request@autox.team.net" target="_blank">mgs-request@autox.team.net</a><br>
<br>
You can reach the person managing the list at<br>
<a href="mailto:mgs-owner@autox.team.net" target="_blank">mgs-owner@autox.team.net</a><br>
<br>
When replying, please edit your Subject line so it is more specific<br>
than "Re: Contents of Mgs digest..."<br>
<br>
<br>
Donate: <a href="http://www.team.net/donate.html" rel="noreferrer" target="_blank">http://www.team.net/donate.html</a><br>
Suggested annual donation $12.75<br>
Archive: <a href="http://www.team.net/archive" rel="noreferrer" target="_blank">http://www.team.net/archive</a><br>
Forums: <a href="http://www.team.net/forums" rel="noreferrer" target="_blank">http://www.team.net/forums</a><br>
<br>
<br>
<br>
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">dave@ranteer.com</a>><br>
To: "<a href="mailto:mgs@autox.team.net" target="_blank">mgs@autox.team.net</a>" <<a href="mailto:mgs@autox.team.net" target="_blank">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">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>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0001.htm" rel="noreferrer" target="_blank">http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0001.htm</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: tach front view.jpg<br>
Type: image/jpeg<br>
Size: 827772 bytes<br>
Desc: tach front view.jpg<br>
URL: <<a href="http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0002.jpg" rel="noreferrer" target="_blank">http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0002.jpg</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: tach rear view.jpg<br>
Type: image/jpeg<br>
Size: 826250 bytes<br>
Desc: tach rear view.jpg<br>
URL: <<a href="http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0003.jpg" rel="noreferrer" target="_blank">http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0003.jpg</a>><br>
<br>
------------------------------<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">mvheim@sonic.net</a>><br>
To: "<a href="mailto:mgs@autox.team.net" target="_blank">mgs@autox.team.net</a>" <<a href="mailto:mgs@autox.team.net" target="_blank">mgs@autox.team.net</a>><br>
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">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">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>
> <a href="mailto:Mgs@autox.team.net" target="_blank">Mgs@autox.team.net</a> <mailto:<a href="mailto:Mgs@autox.team.net" target="_blank">Mgs@autox.team.net</a>><br>
> Donate: <a href="http://www.team.net/donate.html" rel="noreferrer" target="_blank">http://www.team.net/donate.html</a> <<a href="http://www.team.net/donate.html" rel="noreferrer" target="_blank">http://www.team.net/donate.html</a>><br>
> Suggested annual donation $12.75<br>
> <br>
> Archive: <a href="http://www.team.net/pipermail/mgs" rel="noreferrer" target="_blank">http://www.team.net/pipermail/mgs</a> <<a href="http://www.team.net/pipermail/mgs" rel="noreferrer" target="_blank">http://www.team.net/pipermail/mgs</a>> <a href="http://autox.team.net/archive" rel="noreferrer" target="_blank">http://autox.team.net/archive</a> <<a href="http://autox.team.net/archive" rel="noreferrer" target="_blank">http://autox.team.net/archive</a>><br>
> <br>
> Unsubscribe: <a href="http://autox.team.net/mailman/options/mgs/mvheim@sonic.net" rel="noreferrer" target="_blank">http://autox.team.net/mailman/options/mgs/mvheim@sonic.net</a> <<a href="http://autox.team.net/mailman/options/mgs/mvheim@sonic.net" rel="noreferrer" target="_blank">http://autox.team.net/mailman/options/mgs/mvheim@sonic.net</a>><br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://autox.team.net/pipermail/mgs/attachments/20230730/c68decc6/attachment-0001.htm" rel="noreferrer" target="_blank">http://autox.team.net/pipermail/mgs/attachments/20230730/c68decc6/attachment-0001.htm</a>><br>
<br>
------------------------------<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">paulbhunt73@gmail.com</a>><br>
To: <a href="mailto:mgs@autox.team.net" target="_blank">mgs@autox.team.net</a><br>
Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
Message-ID: <<a href="mailto:86e97849-ea66-aad1-c9f9-0556feb82fb0@gmail.com" target="_blank">86e97849-ea66-aad1-c9f9-0556feb82fb0@gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"; Format="flowed"<br>
<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>
><br>
> <a href="mailto:Mgs@autox.team.net" target="_blank">Mgs@autox.team.net</a><br>
> Donate:<a href="http://www.team.net/donate.html" rel="noreferrer" target="_blank">http://www.team.net/donate.html</a><br>
> Suggested annual donation $12.75<br>
><br>
> Archive:<a href="http://www.team.net/pipermail/mgs" rel="noreferrer" target="_blank">http://www.team.net/pipermail/mgs</a> <a href="http://autox.team.net/archive" rel="noreferrer" target="_blank">http://autox.team.net/archive</a><br>
><br>
> Unsubscribe:<a href="http://autox.team.net/mailman/options/mgs/paulbhunt73@gmail.com" rel="noreferrer" target="_blank">http://autox.team.net/mailman/options/mgs/paulbhunt73@gmail.com</a><br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://autox.team.net/pipermail/mgs/attachments/20230731/0ad7ea29/attachment-0001.htm" rel="noreferrer" target="_blank">http://autox.team.net/pipermail/mgs/attachments/20230731/0ad7ea29/attachment-0001.htm</a>><br>
<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
_______________________________________________<br>
Mgs mailing list<br>
<a href="mailto:Mgs@autox.team.net" target="_blank">Mgs@autox.team.net</a><br>
<a href="http://autox.team.net/mailman/listinfo/mgs" rel="noreferrer" target="_blank">http://autox.team.net/mailman/listinfo/mgs</a><br>
<br>
<br>
------------------------------<br>
<br>
End of Mgs Digest, Vol 194, Issue 12<br>
************************************<br>
</blockquote></div>