I'm in the process of swapping out my engine & ecm on my 1985 Camaro, I changed over to the MAP-style ECM/wiring harness and I have a question.

When I removed the old engine, the place where the oil pressure switch was installed was kind of a disaster - they had multiple adapters and tees with at least two different sensors running off of it. I assume one was for the fuel pump and the other for the gauge.

The new wiring harness came with instructions that called out a very detailed oil pressure switch (ECH OP6660), which I got from Napa. However, on the Napa website it lists this part twice - once it says "fuel pump pressure switch" and for the other one it says "oil pressure light switch".

So...is this the only switch I need? Or am I going to need a second one for my gauge? Not sure if it matters but I'm going to be installing an AutoMeter oil pressure gauge once the engine is in.

 

Two type of 3 pin sender units available; one works with idiot light , the other with pressure gauge
(other 2 pins are OP switch for pump )

http://www.motorcityreman.com/generalmotors14.html

Autometer may require it's own special sender unit, check first

 

Thank you for the response, but I'm still confused. How do I know if the one I have runs a light or gauge? The GM cross-reference is 25037045. If it runs the gauge, I won't need a second one, right? Unless AutoMeter says they need a specific sending unit (which I don't think the meter I have does, if my memory serves me correctly).