NissanDiesel forums

I can't help you with the differences in the part Nos.

From what I see, there is only the one oil pressure sensing device, and it's obviously a sending unit for a gauge system. If that's true (only this one sensor) and your gauge is showing good pressure but some warning device is babbling on about low pressure, you likely have some electronics failure up at the gauge end.

If it was me, I'd plug in a decent quality mechanical gauge at that sender port location, just temporarily for testing, to verify the electric gauge's reading. After that's verified, you can proceed to repair or lobotomize the low pressure warning system.

_________________
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.