1994 c1500 5.3 swap

[nettles]

I've looked and searched and thought I'd found the schematic I needed but according to PSI conversations the 94 is different gauge cluster wiring than the other square dash models. I've gotten all except the tachometer, coolant temp, and speedometer working. And obviously the PSI harness has the wires for them to but I can't find the correct wire under the dash. Can someone help? With all the knowledge floating around on this forum I know someone has the answer for these three gauges to work. The battery gauge works great along with the fuel gauge. I'm not sure what's happened to the others. Please?

[Steve A]

The folks at PSI are probably a lot more familiar with the instrument cluster wiring than I am but my book shows the break between 94 and 95 models. All models are listed as white wire for tach and dark green for temp gauge. The only difference shown in my book is the speedo wire is light blue/black on earlier models and dark green on the later ones. I'd be afraid to bet on my manual as it's not a factory service manual but you never know. I'm sure you've seen posts on here about the need for an additional resistor for the tach, maybe there is 2 dark green wires and they are switched? Just a thought.

[chvy=power]

I'm in the exact same dilemma myself. Except I'm working on a 95 obs truck. here is what Iv found about the speedo....


I'm still at a loss on the tach tho

[Steve A]

Found this, should answer pretty much everything Net. Hope so anyway. Good luck.

http://www.ls1truck.com/forums/showthread.php?t=47095