Can someone help me with where I can find a wiring diagram for a 92 W-250 possibly on-line somewhere? My speedometer has totally quit. I replaced the speed sensor already. It seems to be an electrical problem as it either works or it doesn't (no erratic needle movements). If anyone has had similar problems please let me know. I am at 299,833 and the odometer has also quit. I would at least like to see 300,000. thanks