I tried to fit the new pressure switch. I carefuly followed the instructions which said "do not remove the presure switch screws" but found that the pressure switch housing on the pump masked one of the screws that I had to remove so I had to remove the pressure switch screws to remove the switch to remove the body screws. Are you following me?
The instructions also said that if I was careful I wouldn't need to disturb the internals. I was very careful and removed the top body. Then came the surprise!
The internal sealing housing containing a rubber seal was sort of triangular in the new pump and circular in the old design (seen on the right). Those crafty Mexicans had made it so that you couldn't fit a yank pressure switch to a Mexican pump!
I now have issues with two supliers. One on winter holiday who supplied the pump that doesn't work and one a 40 minute drive away who supplied the part that doesn't fit.
I have put it all back together as it was except that I had cut the power cable from the switch to the motor!
Now I am seriously considering Tony's remote pressure switch idea.
23 hours ago