Anybody know where I can get a oil pressure sending unit for a 1952 F1 239 engine in a 12 volt. I just got the old truck rewired for a 12 volt system using an ez wire kit and every gauge works except for the oil gauge. I checked out the wire and it is hooked up right to the unit. I think I have a bad sending unit that needs to be replaced. Truck runs great now except I need to know how much oil pressure I'm getting. Wiring system worked out great. Thanks for all the information that everyone has given me over these last few days on wiring.