I sure am glad that I rigged up the "pump on" light, last year. I got in the habit of looking at it every time that I washed my hands in the bathroom sink. Last night I noticed a problem, the pump would run for 2 seconds, off 4 seconds, on 2 seconds, off 4 seconds, and do that until I turned off the faucet.
Without the light, I never would have known there was a problem until the pump would have died.
The guy that installed the system many years ago came out and pulled the pressure tank. It had lost pressure down to 12 pounds. Raised it back to 42 pounds and everything is working right again! When the light is on the pump is running. :thumbsup:
For the non-believers, here is the in the casing pressure tank.