Hello! Just installed a well and well pump three months ago. All brand new. Today heard a hammering noise outside. Traced the noise to our basement and noticed the pressure gauge needle was jumping and making noise in the lines and shaking the lines every second. I installed a used pressure tank and assumed the bladder went bad so I went to Lowe's bought a new tank, just installed it, and the noise is still there. As soon as the water is used in the house and the pressure drops and kicks on at 30. The hammering stops until the needle reaches 50 and as soon as pump kicks off, the hammering and needle jumps again. Please help.