Well its still fucked. It was working perfectly, 65psi, the flutter from the guage had dissapeared, the turbo and lifters had shut up. then a quick blast up and down the drive, blip the revs a bit and zero oil pressure

So culprit could be one of several things.

Guage and warning light faulty

remote filter and pipework faulty

pressure releif valve sticking open, closes when cranked on the starter

pickup still too close to the sump

something I haven't thought off