When the motor is up to operating temp and idling? I just put on mechanical gauge on the car and wanted to see what is normal. As far as I know it's a standard volume oil pump. Car is 88Gt.
It's going to vary depending on your oil weight, oil filter type, bearing clearances... Anything over 10 psi at idle is good. I believe the rule of thumb is 10 psi for everything 1000 rpm.