We keep losing water pressure and then we reset the pressure gauge to start it will gain pressure but when we use the water it drops to 0 again. We replaced the well troll pressure gauge it seemed to help but then started all over again! What could the problem be?

Need a little more info.

1. Is your pump in the well or above ground?
2. When you say you reset the gauge, I assume you mean you reset the switch by moving the little lever on the side?
3. Is your area undergoing a period of low rainfall at this time?