captive air tank and water pressure
There may or may not be a gauge on or near your pump.
If you have a half-horse pump, it probably is set to 20-40 psi. If you have a 3/4 hp pump, it probably is set at 30-50, just for a guess.
You can install a small 100 psi gauge near your pump. If you install it on or before your pump, it will zero down when the pump is running because that will put it on the suction (well and pump) side, then it will go to the correct pressure when the pump cuts off.
If you install it on the discharge side, it should give you current pressure readings as it goes on, pumps up, and goes off.
It just depends on where you plumb it. Most people just install it on the pump, because that is easiest since there probably is a spare 1/4" plug on the pump head that can be removed to install a gauge.