[Tom Line]

Let's step back for a second. The nason pressure switch will shut off at 125 PSI, and turn back on at something lower than that (80 I think?). This will serve to keep enough pressure in the system that your regulator will never slip below 60 psi.

Is that what you're talking about, or are you trying to set the pressure in a different part of your system? That will require a pressure gage and a bit of programming, or another regulator.