High Oil Pressure

[8upZR1]

Hello all, I hope you are enoying life. I have recently put my ZR1 back on the road after having replaced the head gaskets and lifters and just about everything else. I have noticed that my oil pressure gauge is reading high. It is off the scale in fact when the motor is cold and at idle. When the motor is revved up the needle goes way off scale. When the engine is hot and at idle the oil pressure will go down to the very top of the mark, I think its 80 or 90 PSI. I am not sure if the gauge is reading correctly but I do know that before my head gasket problem it read normally. I replaced the oil filter thinking that it may be clogged but it looked good inside and the new one made no difference. Anybody have any ideas? Earlier this year the motor would not start because the lifters were pumping up and keeping the valves open. Perhaps the high oil pressure caused the old lifters to fail? I dunno, but any help would be appreciated.