I'm installing a tachometer on my 1991 GMC Sonoma which has the 4.3L V6 fuel injection.
There's no signal port or inductive pick-up option, so the only way I can see to connect the tach signal wire is to splice it into the (-) negitive ignition coil wire. However, the (-) negitive connection from the coil to the distributer on this engine is actually two wires, one white and one red. Both go into a single plug connector at each end.
Does anyone know which (white or red) would be the correct wire to splice into for the tachometer signal?