I'm trying to figure out how to fix this myself. I got the car from a friend recently and he told me about the problem. he told me he took the electronic dash out and tested it in another Riviera and it worked fine but in his car it's not coming on. I was wondering where would the fuse box be to check and see if it's the fuses? Or any other suggestions to get this fixed because I don't want to be driving not knowing how fast or how hot this car is getting, or running out of gas. Thanks Love the Forums!:banghead:

I have a 1990 Riviera with the same problem. Did you ever figure out your dash problem. I just bought mine and it will come on for a couple of seconds and then go off for a long time. Seems to be no rime or reason to when it comes on.