Im not sure of how to reset the connections. Your correct I did take it about further do to the fact that one of the old bulbs fell through and I figured if I took it apart I could get to it. I was wrong
If the circuit board is damaged, it's going to be a big-bucks repair, $250-$350 for a new gauge cluster. I'd look for a replacement unit from a junkyard. When you sell the car someday, you'll have to indicate that the true mileage is unknown.