The pressure switch it out on my Mastertemp. The Pentair part is 42001-0060S and looks to be a "standard" pressure switch with 1/8" npt threading.
I called by local pool supply place (try to support them when I can) and they wanted $55 for a generic replacement. Online I can find a generic replacement with 1/8" npt for $20ish deliveried to my door.
http://www.poolsupplyworld.com/Len-Gord ... 0120-3.htm
Or can bump up to a stainless base:
http://www.poolsupplyworld.com/Len-Gord ... 0122-3.htm
Any thought on going with a generic? Anything special to lookout for?