What is causing my electrical issues?

90tbirdsc

Registered User
What is causing my electrical problems? After 3000rpm the information center goes dark, and the tach at much after 3500rpm it dances around and will peg it's self and then go to around 4500 rpm and go up and down in rpm and then if I shift and the rpm drops everything works fine.

Any ideas?
 
First guess would be ignition switch.....probably 75% probability, loose grounds somewhere would probably come second at 15% or so, DIS maybe 5% then wiring problems next...that would be my best guesses.....Dan
 
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