Sorry, missed that part about changing the sender already. At this point it is advisable to get a mechanical pressure test done. This way it is going to give you a warm fuzzy (know what I mean?). If the pressure is fine then it is time to look at the gauge itself. When I worked at the dealership we had special tools to check pressure gauges. It was basically a variable resistance dial that we would put at a particular resistance and then check to see if the gauge lined up with what was dialed in. Not so easy anymore. Darn, miss having access to Special Tooll # *********.
If the oil pressure is actually high, there are a few possibilities here. Oil pressure is usually dictated by the bearings themselves (crank and cam), the more wear, the less oil pressure (seeing that pressure is a inversely propertional to flow). The maximum oil pressure is set by the pressure relief valve located in the oil filter bracket assembly. If your pump is working fine and bearings are good and the pressure relief valve isopening properly, the oil pressure will be good. If the relief valve is not opening properly then pressure is capable of increasing with the increase of RPM (flow) without a change in restriction (relief valve) (it is a formula).
The other area that may be a restriction could be the oil filter. What brand have you got and how old is it?
Long and short of it....pressure test with a gauge. With that you know you are safe.
1992 Bonneville SSEi
White, grey Leather interior.
Tinted windows and blackouts on headlights.
Custom high flow exhaust, Everything replaceable - DONE
300 000 kms original engine, tranny 2 rebuilds.
Playboy Bunnies Embossed in Tint. Oh Yah!
Ever Seen a Polar Bear in a Snow Storm?