Had low water pressure. Pressure tank was bad so replaced it along with pressure switch,check valve,pressure gauge.pressure switch is 30/50. Pressure in tank is at 29psi.gauge stops at 22psi goes no further. Tried to adjust switch with no result. Can hear pump run does not shut off on its owen. I have 240volts at the pressure switch. Can you help me please I'm stumped? THANK YOU!