my speedomiter doesnt work, and it hasnt since i bought the car, what can i do to find out whats wrong with it ? is there a fuse that needs to be replaced ? a wire to plug back in ?

 

Well your best bet is to get in behind the cluster see if any wires came off or blown fuses like you say, but at most you might have to find a replacement cluster, i suggest a scrap yard, i know thats where i found my new one when my old digital broke.
good luck