J
Only found same german supplier for the pressure switch as well. I would contact the manufacturer. The thing is with these cheap single pistons is often even replacing the switch, they won't always work. They aren't meant to last a long time or be used for a long period.
I bought a 25ltr job from Aldi, great compressor for this work but WOW - HOW LOUD IS IT ??? . would love to try to do a freezer conversion on it but as it is in my attic i don't think the other half would appreciate it if i got it wrong and blew the roof off