I have had the stock 30# gauge in my '42 for 15 years and in my COE for 1 year, both have later high pressure 235s. I have had no problems with either. You do peg the gauge when driving but when warmed up you get a reading at idle. You don't know how high the pressure is, but the gauge functions as it should to warn you of TOO LOW pressure.
I doubt the gauges are very accurate anyway. I tested my COE engine with a quality oil pressure gauge hooked up at the block and it pegged at 42#, which I assume is where the pressure relief valve is set and after warming up would idle at 30#. After installing the gauge with it's very long oil line (in the COE it must go forward and up and then back through the firewall) I will get start up readings pegging the gauge, however, hot idle readings are 10# but I don't believe it. As long as it behaves as it usually does I am not going to worry.
Unless your wallet is too fat or you just want something to tinker with, I would leave it alone.
Kent
