Hi
I have the AUTOMETER shift Light with 3 wires, 12 volts switched ,, ground,, neg coil.
I hooked all up and hooked the Tach signal to the Gray wire on the back of the Tach put in a 9600 rpm Pill and Its does NOT work..:confused2:
DO I hook it to the Neg on (one) coil ? or the neg of all...