The switch may be adjusted to close to the pedal. Pull up on the pedal to see if it goes off. My 40 was like that when I first got it. Simple adjustment to back the switch out a little.
You can buy the pins separate and crimp them yourself, need to buy crimpers too. Corsa Technic - https://www.corsa-technic.com I can look up pin part numbers when I get home.
My pressure switch went bad. I had to disconnect it and jumper the connector. It was causing it to turn on and off about every 10 seconds. Was driving me crazy.