Oil Pressure sending unit

[Jrgunn5150]

Can they be mismatched? I have a 90 cluster and a 79 sending unit for a gauge. It's the correct sending unit for a gauge, but not what shows on Rockauto for a 1990 R1500 Suburban.

I have part number PS 154. Rockauto says a 1990 takes part number PS 262.

 

[eskimomann209]

I think ones a plug style wire and the other is like a spade?
It’s the OHMs you need to make sure are the same

 

[Jrgunn5150]

I think ones a plug style wire and the other is like a spade?
It’s the OHMs you need to make sure are the same

Correct, I have the spade one, I'm just curious if it actually reads any different.

 

[Matt69olds]

There is a 60 and 80 psi sending unit, it should be stamped on the threaded end of the housing. If you put a 60 psi sender on a gauge calibrated for a 80, it will read low oil pressure. I had a 78 Grand Prix years ago, I swapped a 455 olds in place of the junk 301 Pontiac engine. Kinda worried me why the oil pressure was reading low, the engine was fine in the car it came out of. Put the proper sender in it and was back to normal