I’m driving home tonight doing about 55 to 60 down the freeway when i notice every once in a while to gauges on my dash, temp, tach, speedometer and fuel, would jump a bit and then come back inot place. The speedometer would jump up about 5 mph and then jump back. The fuel would jump down to 3/4 or 1/2 a tank then back up to full. Once I got off the the interstate and was driving slower it increasing got worse. By the time I arrived home the speedometer had quit working completely, the tach was pretty much stuck in one position no matter my acceleration, and the fuel was still bouncing around a bit.
Anybody have any guesses as to what is going on here. It’s a '96 Grand Am.