Me same type of set up too.
first week wfp(last week), so still learning, I cracked my flow controller on Thurs, spent same eve and Fri morning trying to buy another, nobody had one. Finally about 11am bought one, cost me time and money. Hopefully learnt a lesson.
Now building up a collection in a box of spares to keep in my van.
By the way seems to me we are gonna batter our new equipment in the way we work, so, if a pump is only supposed to last a year then why worry about burning the pressure switch out if it lasts longer than a year.......SURELY WE SHOULD ALL KEEP A SPARE TOO!!!!!!!!