Just took the 88 base coupe out for a short drive. It is (finally) running great. Drove about 20 minutes to a buddy's house and stayed about 30 minutes and left. When I left I noticed the stereo wouldn't come on but oh well, no biggie. Then I noticed the speedometer wasn't working either. Got home, changed clothes and went to go check fuses. I started the car to bring it in the garage and everything is working. Any ideas?