oil pressure gauge issue

[helio300zx]

Hello!! so recently my 300zx cluster gauge within the last 2 day ( only happen within the last two day prior to changing my tail light, i doubt that what caused it ) oil pressure is showing negative barely even budge in the same position as when the car is turn off. From what I gather online it is most likely the oil pressure sensor near the firewall, I was wondering how can you tell it is a oil pressure problem, and not a faulty sensor?

p.s the oil pressure gauge sometime works a bit sometime doesnt, where it sometime in the 40-50 range? then drop back to 0 when I am driving ( staying under -1 to -3 psi on boost) I drive faster hitting 11 psi boost just to see if the oil psi would go up but still barely budge

[t.mcginley.jr]

If you had low oil pressure, especially 0, your engine would seize up in a matter of minutes (if that). If it sounds like its running fine, then its 99.999999999% the sending unit. If your sending unit is stock from the factory, its 100% bad, they just go out from age.

This is what you need:



They are like $32 + shipping on RockAuto, you DON'T need an OEM one, it isn't that complicated of a part or something you need super high quality for. It threads into the oil filter tree like so:



Should be able to get it off with an adjustable wrench from under the car. I believe when I installed mine I did use a little teflon tape on the threads. You could probably also use a smidge of RTV, but only a tiny bit to seal the threads.

[helio300zx]

thank you so much! I will try to install it myself asap.

[t.mcginley.jr]

thank you so much! I will try to install it myself asap.

No problem! Let us know how it goes

[Caramrodttz]

i have the same problem with mine. will for sure check into this in hopes it fixes the issue!

[z.Leinbach]

sometimes it's the gauge itself. i would have the oil pressure checked with a manual gauge first to verify.