yeh i have a au series 1 xr8 and had similar problems. i have had all the so called ford fixes done and i still have the occasional gremlin with the oil pressure gauge. ford tested the engines oil pressure and found no problems. so i have grown to live with the problem. pisses you off a little, but at the end of the day it doesn't effect the way my baby goes and i just turn a blind eye when i see the needle nudging the red zone.
IF IT AIN'T BIG ENOUGH STROKE IT.
5 speed xr8 ,silouette in colour,17in tickford 5 spokes , momo steering wheel and momo gear knob. twin 2 1/2 inch exhaust with race magnum mufflers. custom stereo system.