Water pressure high and low... pressure gauge up and down and switch clicking on and off... we replaced the water tank, gauge and pressure switch with no luck.. what is wrong?. could it be the water pump?

could it be the water pump?

Nor was it the gauge or the switch. Only thing it could have been was the tank. Tank had ruptured bladder and was water logged.

Who installed the tank and did they set the per-charge air pressure to 2 pounds less than the pump cut on pressure.

Water pressure high and low... pressure gauge up and down and switch clicking on and off

I'm not sure I understand what your problem is. The pressure should swing from low to high by about twenty psi. The switch is supposed to click on and off. Are you saying that it is doing this even when water is not being used? If that's the case, then you likely have a defective check valve or footvalve, or possibly a leaking wellpipe.

Is this pump in the well or above ground?