I just installed the autometer oil pressure sending unit,but now i'm not sure which wire goes to the sending unit.The sender for the light that i pulled out had 2 prongs,the new sender only takes one wire,and the plug has 3 wires.Here is a picture of the plug,anybody know which of these wires i need to use,it's in my 80.This is the only thing keeping me from finishing the gauge swap,so hopefully someone can help me out here.

 

Wow,there has been 162 views and nobody knows which wire to use haha.

 

Most autometers are mechanical They use no wire. If it is elec, run a new one!

 

Yeah,this is the electric version.I may end up just running a new one,but i'm thinking with 3 wires,they are prabably a power wire,a ground,and the sending wire so i'm going to try and figure them out here in a while.This is all thats keeping me from finishing the gauge install,so one way or the other i'll get it done today haha.

 

Autometer doesn't have a diagram on their sight?

 

Looks like he's trying to tap into his existing wiring, both under the hood and the corresponding wire(s) under the dash. He'd need a factory wiring diagram specific to his car for that, if he can't figure it out. I'd just run a new wire myself, and abandon the factory wires.