Oil pressure sending unit should be located somewhere near the oil filter. check that the wire is attached to it and is not grounded. If engine is not making any tapping noises chances are that the sender is bad. If after changing it, the problem persists, put a mechanical gauge on the system (attach where sender is) and read actual oil pressure (should be no lower than 15psi when hot but I prefer better than 20 hot at idle, 40-50 running at 2000rpm)
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Thanks, will try as you suggest.
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