I was driving my 90 Iroc (it has the 90-92 dash) and hit a bump on the highway. When I hit the bump my power door locks unlocked, my alt gauge went to 0, my oil pressure went to 0, my RPM creeped up to max, and my speedo is stuck at 77 mph. Obviously there's a short or ground problem somewhere, but where do I start to look? I unhooked the battery just in case when I got it back home and the speedo is still at 77 mph. It's electronic, so how is it still stuck there?

 

For future reference, it was a blown fuse.