I serviced a Cremina with a bad pressure stat. The micro-switch was fine but the proprietary membrane/housing was sticking, causing overheating.
Instead of importing the new (expensive) part from Switzerland, I replaced the brass housing with a copper tube and a MATER p-stat. The $40 part worked well... When set to disengage just shy of 1 bar it would re-engage at .08 bar.
Picture shows the new installed MATER and at bottom the original Cremina stat.