What is the pressure you keep your well tank at? I have a 100psi tank but am not too sure what the pressure should be set at. Also what should be the gap in pressure from when the well pump turns on to when it turns off. Mine is at about 20 pounds difference. Say if the pressure is at 60psi and I turn on a fawcet, by the time it gets down to 40psi to turn the tank on the water pressure has dropped bigtime. Should it be around a 10 pound difference? Thanks for all the help.