Another oil pressure problem

Some points to consider... an engines oil is measured by pound per square in rather than gallons per minute which simplifies the gauging. Pressure readings on a flowing system can be misleading since its actually back pressure your seeing. You probably have plenty of flow or wash within the engine at all times. FYI it only takes 7 to 9 PSI to tur off an oil light. Guages are nice if long as they dont worry you to death. A warning light is better in that respect.
Any particular reason you run 20-50 rather than 10-30 ?