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If your gauge shows that response, there is clearly too much pressure. The pump output is pretty much unrestricted (or should be) so the problem will be in one of only a couple of places. I'd check that the top of the pump body just below the oil pump/distributor drive skew gear to see that there is clear passage for the oil to get through and that the hole where the oil exits the pump is clear. Also look at where it enters the valve chamber to make sure that is clear.
It has nothing to do with gaskets unless something (like a part of a gasket) has become lodged in an oil way between the pump and valve chamber.
Maybe you drop the sump, remove the oil pump, check it for blockage and try blowing air through from inside the valve chamber in the reverse direction. If you dislodge something, make sure it is removed from the engine or disaster awaits.
Please let us know what you find.