I agree with testing it with a known reliable, numbered gauge. As a general rule, 10 lbs. pressure per 1000 RPM is sufficient.
That you have "some" oil pressure at idle is good.
That's where bad oil pressure will first show up, especially if the pressure drops to nothing when warmed up idling. Reason is, the pump is turning slowly and can't completely pressurize the system due to excessive bearing clearance or worn pump.
Providing the pressure relief valve is functioning properly, adjusting it WILL NOT increase idle oil pressure. The relief valve does nothing until the pump speed increases with RPM, thus increasing the volume of oil being pumped, thus overriding the valve spring pressure, allowing excess oil to return to the sump.
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