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Re: [Mgs] Mgs Digest, Vol 194, Issue 12

To: mgs@autox.team.net
Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12
From: Paul Hunt <paulbhunt73@gmail.com>
Date: Tue, 1 Aug 2023 08:13:10 +0100
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
References: <mailman.3.1690826402.17351.mgs@autox.team.net> <CAP7dBXCk4hzrb9Sj+Ptrny-d40Pms5jk5jhttjOVnATrLE5eNA@mail.gmail.com>
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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 2:08â?¯PM <mgs-request@autox.team.net> wrote:
>
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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@ranteer.com>
>     To: "mgs@autox.team.net" <mgs@autox.team.net>
>     Subject: [Mgs] mga 1500 with early 5 main mgb engine
>     Message-ID: <8ba46f6ebee14b168b5e753f84b72499@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@sonic.net>
>     To: "mgs@autox.team.net" <mgs@autox.team.net>
>     Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
>     Message-ID: <983CC3D7-127F-4FD9-97E0-7533897C6FFD@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@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>_______________________________________________
>     >
>     > Donate: http://www.team.net/donate.html
>     <http://www.team.net/donate.html>
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>     >
>     > Unsubscribe:
>     http://autox.team.net/mailman/options/mgs/mvheim@sonic.net
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>     ------------------------------
>
>     Message: 3
>     Date: Mon, 31 Jul 2023 08:38:26 +0100
>     From: Paul Hunt <paulbhunt73@gmail.com>
>     To: mgs@autox.team.net
>     Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
>     Message-ID: <86e97849-ea66-aad1-c9f9-0556feb82fb0@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?
>     >
>     >
>     > _______________________________________________
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>     ------------------------------
>
>     Subject: Digest Footer
>
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>     ------------------------------
>
>     End of Mgs Digest, Vol 194, Issue 12
>     ************************************
>
>
> _______________________________________________
>
> Mgs@autox.team.net
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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">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default" style="font-size:large">My guess is
          an MGA tach face (Jaeger) or perhaps MGA tach face &amp; 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
          2:08â?¯PM &lt;<a href="mailto:mgs-request@autox.team.net";
            moz-do-not-send="true" 
class="moz-txt-link-freetext">mgs-request@autox.team.net</a>&gt;
          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>
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          <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 &lt;<a href="mailto:dave@ranteer.com";
            target="_blank" moz-do-not-send="true"
            class="moz-txt-link-freetext">dave@ranteer.com</a>&gt;<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>"
          &lt;<a href="mailto:mgs@autox.team.net"; target="_blank"
            moz-do-not-send="true" 
class="moz-txt-link-freetext">mgs@autox.team.net</a>&gt;<br>
          Subject: [Mgs] mga 1500 with early 5 main mgb engine<br>
          Message-ID: &lt;<a
            href="mailto:8ba46f6ebee14b168b5e753f84b72499@ranteer.com";
            target="_blank" moz-do-not-send="true"
            
class="moz-txt-link-freetext">8ba46f6ebee14b168b5e753f84b72499@ranteer.com</a>&gt;<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>
          <br>
          Message: 2<br>
          Date: Sun, 30 Jul 2023 17:52:40 -0700<br>
          From: Max Heim &lt;<a href="mailto:mvheim@sonic.net";
            target="_blank" moz-do-not-send="true"
            class="moz-txt-link-freetext">mvheim@sonic.net</a>&gt;<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>"
          &lt;<a href="mailto:mgs@autox.team.net"; target="_blank"
            moz-do-not-send="true" 
class="moz-txt-link-freetext">mgs@autox.team.net</a>&gt;<br>
          Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
          Message-ID: &lt;<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>&gt;<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 &amp; 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>
          &gt; On Jul 30, 2023, at 5:22 PM, dave northrup &lt;<a
            href="mailto:dave@ranteer.com"; target="_blank"
            moz-do-not-send="true" 
class="moz-txt-link-freetext">dave@ranteer.com</a>&gt;
          wrote:<br>
          &gt; <br>
          &gt; Negative ground, car runs smoothly, need to install the
          electric tach which supposedly was previously installed in
          this car and working.<br>
          &gt;  <br>
          &gt; On the back view, what hooks up where?  I am pretty sure
          the tab, and the screw, are ground.<br>
          &gt;  <br>
          &gt; 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>
          &gt; &lt;tach front view.jpg&gt;&lt;tach rear
          view.jpg&gt;_______________________________________________<br>
          &gt; <br>
          &gt; <a href="mailto:Mgs@autox.team.net"; target="_blank"
            moz-do-not-send="true" 
class="moz-txt-link-freetext">Mgs@autox.team.net</a>
          &lt;mailto:<a href="mailto:Mgs@autox.team.net"; target="_blank"
            moz-do-not-send="true" 
class="moz-txt-link-freetext">Mgs@autox.team.net</a>&gt;<br>
          &gt; Donate: <a href="http://www.team.net/donate.html";
            rel="noreferrer" target="_blank" moz-do-not-send="true"
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          <br>
          ------------------------------<br>
          <br>
          Message: 3<br>
          Date: Mon, 31 Jul 2023 08:38:26 +0100<br>
          From: Paul Hunt &lt;<a href="mailto:paulbhunt73@gmail.com";
            target="_blank" moz-do-not-send="true"
            class="moz-txt-link-freetext">paulbhunt73@gmail.com</a>&gt;<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><br>
          Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
          Message-ID: &lt;<a
            href="mailto:86e97849-ea66-aad1-c9f9-0556feb82fb0@gmail.com";
            target="_blank" moz-do-not-send="true"
            
class="moz-txt-link-freetext">86e97849-ea66-aad1-c9f9-0556feb82fb0@gmail.com</a>&gt;<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>
          &gt;<br>
          &gt; Negative ground, car runs smoothly, need to install the
          electric tach <br>
          &gt; which supposedly was previously installed in this car and
          working.<br>
          &gt;<br>
          &gt; On the back view, what hooks up where?? I am pretty sure
          the tab, and <br>
          &gt; the screw, are ground.<br>
          &gt;<br>
          &gt; The other two ? one needs to go to power and the other to
          the coil.? I <br>
          &gt; think one is a female bullet connector; the other is
          male.? Which goes <br>
          &gt; to power and which to the coil?<br>
          &gt;<br>
          &gt;<br>
          &gt; _______________________________________________<br>
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          End of Mgs Digest, Vol 194, Issue 12<br>
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