I just replaced my water pomp, the water tube and the wiring. Everything is working fine except this weekend, the pressure stays at around 32. Even though the gage shows around 32, I feel it is still at around 50. When I run the water, it takes a while to reach the 30 and then the pump turns on... The pressure never goes down to zero, it is stable. Could the problem be the gage or the tank?

Use a tire gauge to check the pressure at the top of the pressure tank. The reading there should be the same as the reading on the gauge.

Tire gauge... that's the trick !