As I'm trying to get my steam system working property in my new house, I started by replacing the radiator vents, which weren't working, as well as replacing the main vents (and significantly increasing the main vent capacity). I also installed new pressure gauges, including a 0-5 psi gauge. I checked the pressuretrol settings, and it was set to about 0.5-1 psi cut in with a +1 differential.
When I tested the system, I watched the pressure rise to over 3.5 psi before I shut it off. So something is wrong with the pressuretrol. I figure either the unit is broken and needs to be replaced or the installation is bad (see picture). The pigtail to the pressuretrol has been cleaned, so I'm pretty confident that's not blocked. But getting pressure at the pressuretrol relies on going though this super old looking low water shutoff, so the path goes below the water line. Does this path make sense? Will the pressuretrol get the correct pressure in that location?
Can I move the pressuretrol anywhere I want that gets steam pressure, like onto the newly installed pressure gauge system (seen partially at the top of the picture) that I know gets pressure? If it still doesn't work properly there, I figure I need to replace it. Does this seem like a reasonable troubleshooting order?