so my speedometer has been acting crazy for the last year or so. some days it works fine some days it doesn't work at all. sometimes it will hit zero and then go negative and point straight down while other times it will say I'm doing 100mph and I'm only going about 30. does this sound like it can still be the gear in the tc? are these speedometers electronic or do they also have cables running the needle? this is on a 95 5.2.