sorry if i posted this in the wrong section.
my problem is that i cannot get my factory tach to work on my 91 camaro rs that was a tbi 5 spped but now is a 355 carbed. i hooked a aftermarket tach up and it worked fine. i know the factory tach worked when pulled. did the ecu stand as a ground maybe? also my fuel gauge is out?? i got my speedo to work but these to are giving me problems. if someone could but in and help that would be awsome..

thanks guys