Oh man that sounds nasty! The fact it reads to a negative value is... Odd... That would nearly make me think is it firmware? Unless 0V doesn't equal 0psi?
THIS.
I was losing my mind looking at the OEM gauge which does 'work' in a R34. I lost a lot of time and sanity figuring out how it works and whether I could trust it. The only downside I have now is my wiring is almost correct myself, and occasionally my working Oil pressure sensor likes to randomly spike to -11PSI once every.. oh I dunno. Hour or two? It gives an ear splitting alarm for no reason which is fun. But I know my oil pressure didn't truly drop from 45psi to -11psi to 45psi over a 0.01 second range while cruising at 60kmh in 5th gear :p
Save your sanity and know for sure!
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