can anyone tell me where I can find something that would make the
speedometer compatible with a 1994 5.7 engine from a camaro on a 1990
5.7 trans am, I know there is some kind of harness you can buy, but
don't know what and where to look, I almost done with the restoration
on my T A, and thius is the only thing left that doesn't work, thanks
Your speedometer is driven off the transmission not the engine. If
your using a 1994 transmission with a 1990 Mechanical speedometer, it will
not work. If you have a electrical drive speedometer, you can adapt
the harness. The way to drive a mechanical speedometer is to use a
1993 tail housing and output shaft, which used a mechanical speedometer
Now if your referring to your Tachometer (RPM's), you just need to
find the tach signal output from the optispark unit, and connect it to
your clusters tach signal input.
Most old style Electrical Speedometer drives are the same as
mechanical speedometer drives. This means you have a gear to gear set up,
with a changer box. The changer box converters the mechanical input in
to a electric signal.
Later cars went to a system where no mechanical drive is used.
Instead it uses a VSS (Vehicle Speed Sensor).
And no, in the late 80's and 90's a good number of cars still used
a cable driven speedometer.
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