Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Might you consider switching the gauge with one of the pressure gauges offered by PMR, that has threads that are adaptable to the pipe and fittings you are already using?

I may eventually entirely go with a different boiler. The Jensen boiler wasn’t designed for PM pipe work, which is what makes my plant unique,  but no matter what I do with the 2 (5/16-24) holes, I still have a #12-32 hole where the current guage is at. All I can find for that type of fitting is screws. 

My absolute best bet at the current configuration is to get a Tee fitting and put it the first elbow on the steam line, and put a 1/4-40 SV on the top, and put a 1/4-40 plug on the rear.

I just can’t find any good 1/4-40 SV’s, except ones that are way over priced on eBay.     

If I was a machinist I could make my own stuff.