Almost there — just about ready to go. I’ve gathered all the missing parts. A local machinist came to the rescue and turned a custom adapter fitting, modeled after a T-joint, to make everything connect neatly. He’s an old-school kind of a guy — the type who can tell you the thread pitch in turns per inch without putting on his glasses and we mostly use metrics here.

The T-joint:

The adapter fitting:

With a washer and an O-ring on the pressure switch:

I also calibrated the pressure switch — not under lab conditions, but it does reliably send a signal at 1 bar:

• Latent Heat of Vaporization
• Impreza
• Gd
• Sti