Possible cause of high
oil pressure is blockage in the
oil delivery.
Malfunctioning
oil pump can restrict oil flow and cause high oil pressure indication.
Of course you can never rule out a bad gauge either but I doubt this is your problem.
Oil pressure is measured as the flow resistance between oil pump and bearings in the crankshaft.
If it is actually too high, could mean you are not getting enough oil through the bearings to keep your engine from self destructing.