bobbo

i got a 86 iroc and converted to fit my 350 for tpi and finally got it running alright but my tach, water temp, and oil pressure dont work. the only thing that does the voltmeter so the fuse aint out cuz when i take it out the voltmeter doesnt work. all the needles suck up to zero when the key is on, move when cranking but suck back up when running. i thought it could be the sensors but why would all three be out like that. but any help yall can give we would be great.

technical

You have a ground missing. I believe the original ground for those was under the passenger side dash. I remember doing that type of swap (TBI305 - TPI355) and had to re-splice the harness to fix a similar problem. I just don't remember if it was those specific gauges that weren't working...it was a while ago.

bobbo

thanks for the reply man ima bout to go look