I am preparing to replace my well pump pressure switch- the one that runs the pump when the water pressure gets below a threshold. The articles I have read say to shut off the power supply to the pump then to shut off the valve from the pressure tank to the house and drain the pressure tank. I have a shutoff between the pump and the tank. So the sequence is well > pump > pressure switch > tee to pressure gauge and to valve > pressure tank > softener > house supply. Since I am replacing the gauge and switch on the pump do I need to drain the tank? Can’t I just remove the power from the pump and pressure switch and close the valve then loosen the old gauge and wait for the pressure to dissipate? In this case water spillage is not a problem. Thanks!