oil pressure sender

[rgnewleaf]

I replaced my oil pressure sender on my 77 280 and it now seems to read backwards. Is this the aftermarket sender.

I replaced it with another, also aftermarket, with the same result. Is this a problem with aftermarket senders?

[SteveJ]

What brand(s) are you buying?

[rgnewleaf]

from NAPA auto parts. Echlin

[rgnewleaf]

It reads max oil pressure when the ignition is turned on and goes to less than zero when the engine is started.

[SteveJ]

Well, you could try to see if the sender is still available from Nissan. I can't remember whether or not it is. I haven't purchased one in a long time. Also, the FSM says to use a conductive sealer. The first option that comes to my mind is antiseize, but give others a chance to correct me before you try using that.