can anyone tell me how to splice into the tach wire to hook up a shift light? thanks. other wires are ground and a hot wire

 

Raptor has an install guide for an LT1 car:

http://raptorperformance.com/Chevrol...tall_guide.htm

I don't believe the white wire from the PCM is in the same location on '93 cars as it is on other year LT1s, but you can get the tach signal from the wht/blk wire that goes from the ICM to the coil.

 

Thanks for the link, R&D. I was going to install my '95 shift light to the coil/ICM wire, but the PCM wire will be cleaner.