Hey guys,

I've already just replaced the oil pressure sending unit 3 months ago, but the oil pressure usually reads around 40-60 when the car first starts, then as it warms up it goes back down to about 0-10, but I looked down today while driving and it was still there... The sending unit is new, is there anything else could be wrong? Car has been sitting for a couple years, I bought it from the guy in Nov and have been doing suspension and SU swap. What else affects the whole system? I know the oil pump would affect it.... but are there relays and/or fuses, or wires to check out?

turn on the ignition switch and ground the wire that is connected to the sending unit. This should peg the needle at 70 . This is with the engine not running. If the needle still is on zero , either there is a brake in the wire or a fuze has blown . If the wiring is good and the fuzes all test good , don't just look at them . Test them . then it is a sending unit . Buy a sending unit from Nissan , not a aftermarket one.

If memory serves me,we used to use a factory sender for an early seventies roadster. It would register higher at warm idle.