Originally Posted by Bonneville92V688
I know the white wire on the ICM harness is the tach wire, as I used the same one to tap into on my '94 Century and '96 Ciera. But, is there a easier way than cutting into the wire? TIA!
It'* the same wire. If you want to hook the tach up somewhere more or less permanetly, then trace that wire back as far as it goes in the harness and tap in there. I don't use "vampire" taps. My taste is to take the pin out of the existing connector shell and solder another wire on the same connector (so two wires come out the shell where there used to be just one.) That way I never need worry about the tap cutting the existing lead. When I did the tach on the '90 Bonnie, I didn't even have to do that...the tach wire dead-ended where the ignition wiring met up with the rest of the harness..I had to add the missing pin.
BTW, does your tach have setings for a V6? The tach signal is only going to be 3 pulses per revolution, not the 4 pulses of a V8 (which most aftermarket tachs come configured for.)
If you just want a place to test the tach signal comming out of the ignition, stick a straight pin into shell from the back (parrallel to the wire)...that way you can touch the contacts inside the shell without disturbing the wires.