I saw how the tach is run by the altenator and the previous owner of my truck deffinatly beleived in ghetto riggin everything. My alternator has a different plug on it and has a few wires hanging loose. My tach doesn't work an even my service manual doesn't have a close up of the wires. I was wondering if someon e could take a pic of their working alt. and post it here. Who k nows it may not even be the alt. for my truck just one he got rigged up. Ohh and by the way anyone know where the wires come from or the color codes for the wires that go to the vss in the tranny tailshaft. The sensor is there but the plug is nowhere to be found i'm wondering if the cut it off for some reason but can't find the wires or even know which bundle they are supposed to come from.