I have a ten yr old champion pressure tank and a 135' well. When running water, in the last couple of weeks the water seems to surge, check the guage at the tank and it bounces between 25lb and 42 lbs every few seconds. I assume this is not normal and is going to burn up the well motor. I dont even know where to start. Do I need a new pressure tank or just a switch. I am pretty handy althought not an expert. Thanks