Are you ran into your fuse box at all or directly to the battery? I had a problem that I just got fixed today after sitting in the stereo shop for close to 15 hours over 2 days. My rpm, fuel, and temp Guage would not work, it also said my traction control was off. Don't know if you are having the same type of situation but I found is common ONLY with grand prix. Don't know if it helps just figured I would let you know.