Tachometer hookup/wiring

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> Since the '77 GMC has electronic ignition, I haven't looked yet
> but assume it has the normal GM tach wire connect on the
> distributor.

Paul,

The GM HEI distributor has a "TACH" output next to the power input on the
coil cover. Should be labeled clearly for an easy connection.

Patrick

 

[darren paget]

That is where I hooked up mine. No problems so far. Darren

> Have ordered low rev tachometer for my '77 GMC w/455: 270 degree
> sweep with 4k top of scale. I want to install before my next short
> trip to verify rear end ratio & monitor rpm's. My question is:
>
> I have previously hooked up tachs on other vehicles: one side of
> coil, one wire to ground & one sometimes to power for light--at
> least tachs with a built in sending unit. Since the '77 GMC has
> electronic ignition, I haven't looked yet but assume it has the
> normal GM tach wire connect on the distributor. Is this where the
> normal coil wire would be connected to, since the coil is in the top
> of the distributor? Is this correct? Any other problems that I
> should consider when doing this hook up? Help is appreciated.
>
> Paul in San Angelo
> Just waiting for my next trip.
>
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- --
Darren Paget
76 Experimental
Another Fab Day
paget