Can i wire my window switch to the white "tach wire" off the back of the pcm? The directions say to use the coil negative, but i would rather use the pcm.

are the voltages the same between the pcm's tach signal and the coil negative signal?

 

Yes, you can use that. That is how I wired mine. We tried wiring it off the coil and couldnt get it to work. Used the PCM wire and works perfect.

 

Where is this PCM wire located?

 

Pass. side, under the cowl.

Matt