how do you adjust the pressure switch on a water pump?

Answer 1

theres 2 nuts on the top part of the switch,
a small one and a large one,
[look under the cover there should be directions on how to adjust it,] if not turn the LARGE nut down 1 or 2 turns this will increase the water pressure, watch the pressure gauge, dont go over 80 lb, most switches come set at 50 lb

Answer 2

Try this link it has good information and pictures.
http://www.inspect-ny.com/water/WaterPumpAdjust.htm

Hope it helps.