[rbray]

Come to think of it, I could have rewired the tach wrong.

Maybe someone could help me out.

Here are the the lables on the treminals of the unit:

SIG
BATT
GND

and a seletor swithch with the following positions.

A 4cyl
B 6cyl
C 8cyl
D Alt 12 pole
E None

I have the tach wire from the MSD connected to the SIG terminal
The BATT terminal has switched 12V on it and the ground is grounded on the aluminum dash ( like all of my other gauges are).

The needle either wanders or settles on 7k rpm.

Any Ideas?

Thanks