Pressure switches are typically a small rectangular plastic box (black or gray). They will be connected by a very thin metal pipe to the piping and will have wiring entering them. You should run your water and time the length of time that your pump is running (you'll hear a humming while it is running). That info and the size of your water tank would help in diagnosing the problem.
Here are some pictures.
The whole thing:
http://i5.photobucket.com/albums/y181/Miztiki/Sept2006044.jpg
Water filtration thing:
http://i5.photobucket.com/albums/y181/Miztiki/Sept2006046.jpg
Gauge (@65) and pressure switch?:
http://i5.photobucket.com/albums/y181/Miztiki/Sept2006047.jpg
Pump??:
http://i5.photobucket.com/albums/y181/Miztiki/Sept2006045.jpg
There's some sort of high voltage box in the bottom left of the second picture too.
Do I have the different parts right?
I'll read through your comments again and see what I can find. I really appreciate the help.
