Ok on the Vtech oil pressure switch (green plug) which prong is power and which is ground. I can't find a plug so I am going to "make" a plug till I can find one so my CEL will go off.

 

blue/yellow is + black is -

 

No not the wires. I don't have the plug. When your looking at the plug which prong is + and which is -

 

it depends on what way you look at it you can re-pin it to be either way just match up the colors

 

lol that's the problem I don't have colors to match. I have a OBD1 conversion harness, but no plug. So I am using some connectors as a temp plug. So I need to know which prong is which. Like if you are standing on the passenger side of the car looking at it, which one is the ground.