Power steering pressure switch

Hey guys i was wondering what symptoms do tacos have have the power steering pressure switch goes bad? Ive recently replaced my rack n pinion and im due for a new or rebuilt pump.... So shud i just change switch too? Or how can i chck it?

 

Did you ever figure this out? My 05 Tacoma suddenly has tight steering, intermittent tightness through a full turn. Took it to Firestone and they said "Remove & Replace Power Steering Pressure Switch". Can't seem to find much on it. They quoted $119 + $95 labor. Stealership quoted $159 + $140 labor! Seems like something I could remove and replace myself given enough instruction. I found it online for only $32. This has to be something we can fix ourselves.