Thanks for the info, I have all the wiring figured out,,, lex answered the reason why I can't get the gauge to work........... now I just need to figure where to pin it on the new PCM
The Purple wire goes to PCM C2-38. The Purple/White wire goes to PCM C2-54
Jeff
98 GMC RCSB 2wd, 100% internally stock 305, w/twin T-3 junkyard turbos,Ramjet intake w/42lb inj,12200411 PCM. 4675lbs w/me in it. Best time in 5 passes 13.01@110