oil pressure sensor works backwards?

[Zachalanche]

I replaced my oil pressure sensor on my 89 2.9 yesterday, and it appears to be working backwards. with the key on engine off, the guage shows normal oil pressure. with the engine running the needle is hard against the low side( what appears to be as far as the needle goes.) I'm sure I have oil pressure. the guage starts out in the normal range and slowly goes to the left side of the gauge as the engine is started similar to the way it used to respond going the other direction.

Is it possible the parts store gave me the sensor that is supposed to go with the oil light instead of the oil gauge? any other thoughts on this?
thanks.

 

[Big Jim M]

It is highly possible! Use another parts house.
Big JIm

 

[jhammel85]

I'd start by taking it back and getting another to see what happens. Perhaps its a defective part.