Oil pressure gauge reading.. is it too low??

[mckpaul]

I'm sure this has been answered in the past, but can't search to find it.
Got a stock 305 with a 60 psi oil pressure gauge. What's normal for a reading on this gauge on a running engine at idle speed?... at driving rpms? Just finished a stock rebuild on the motor including a new oil pump, ran with the old sending unit for a while, replaced it yesterday. The gauge is responsive to changes in engine speed, but reads lower than what I would expect. At driving speed rpms it reads somewhere between 15 and 30, and at idle drops down below 15. I know I have enough pressure to close the oil pressure switch by the oil filter that sends voltage to the choke heater and turns off the choke light, so if I didn't have a gauge and only had an idiot light, I assume in reality I have enough pressure that the idiot light would be off, but it seems strange to me that the 'normal' range on the gauge would be down in the first 25% of the scale and not around the middle. Do they all read low like this or do I have an oil pressure problem????