Thanks gents. You got me thinking.
I'm going back to what I had. The oil pressure switch that I took out had 2 sensors one for the dash oil light and one for an aftermarket gauge that I removed a while ago. Mechanic picked oil switch because there was a lot of oil residue and road grime around them mainly around the aftermarket one. I cleaned them up, refitted the teflon tape and went for a 1/2 drive all good. No oil leaking, no oil light and no noisy engine.
Now back to the beers and pool..
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