wiring help
 

i have a 96 f250 with a 12v swaped into her. what im trying to find out is the engine harness that comes into the truck wiring diagram. i was told wire#30 is the coolent temp sensor wire so the stock gauge in the truck will work. but i need to find the oil psi it's suppose to be number 31 i was told but the wire is a diff color. any help would be great thanks. the truck was orginally a powerstroke as well