Sorry, this is not third gen but I think I can only get good info from this board. '94 Sonoma
I recently took the instument panel out and was monkeying with stuff in the dash. I then reinstalled the instruments and the speedometer is motionless as is the odometer. I checked to make sure it was making contact and I believe it has to be. I have wiggled it around plenty while driving it. Everything in the plug area is straight and all the other gauges work.
Could I have fried something by making contact with speedometer plug end? I had the vehicle running when I was working around in there. Not smart. Is there something that will go out if it shorted? Any ideas? Need to know more, please ask.

 

If anybody has had anything strange go wrong with their cars that could clue me in, it is greatly appeciated to hear about it.