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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 â?? 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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>
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<p>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.<br>
</p>
<p>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.</p>
<p>PaulH.<br>
</p>
<div class="moz-cite-prefix">On 31/07/2023 01:22, dave northrup
wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal">Negative ground, car runs smoothly, need to
install the electric tach which supposedly was previously
installed in this car and working.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">On the back view, what hooks up where? I
am pretty sure the tab, and the screw, are ground.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">The other two â?? 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?<o:p></o:p></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre"
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