my oil pressure read low at ide after warmup of thrashing then till last weeek the oil pressure at cold start is peaking now, even after warm up its still peaking but not as much as cold start?

whats wrong?

Sender umit or wire not connected properly or earthing.

My EL 6cyl has oposite oil pressure.
Crusing along it's almost in the upper red zone, put the foot down and it drops off, down to the normal range.
I've read plenty of threads on this matter but yet to have seen this fault.
One can only blame the sender contacts as well, even though I have recenty done a oil change.
Any one got a new view??
No one wants to change that hard to get at sender.