The guages in my 87 Camaro stopped working & a fuse was replaced in an attempt to rectify the problem. Soon after, the guages ceased to work again. I also noticed when the lights are on with doors shut & key in the ignition & engine running, the buzzer stays on. My mechanic believes this is an electrical problem related to a wiring harness. He hasn't completely diagnosed the problems, however. Any assistance would be appreciated. The cigarette lighter is malfunctioning too.