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Nissan gauges are more like guidelines than rules. First of all, check the connector at the oil pressure sender on the block. I have found on my RB30 that the spade connector goes slack over a period...

The SWD. They might still do them. Otherwise it may have to be made up for you.
https://trade.swd.com.au/

Im not sure it they sell to the public or not. But they could point you in the right...

Welcome to the forum mate.

Hi Pilot, welcome.
I concur with Braz,that intro was a joy to read.
Most of 'em are a waste of time opening.
Can't help you with the RD 28 prob, dyed in the wool 4.2 man.

Welcome to the forum mate. Love your attitude, starting from scratch, here to learn, avoiding the internet jerk off "experts" of social media. I am pretty sure you will find answers to all your needs...