Woo-Hoo, back on track.
Installed some doo-dads. Coming out of the side of the boiler is the water level sensor which looks suspiciously like a Champion spark plug. I had to grind down the threads to a slight taper and then file new threads to get it to work in a 1/4" pipe thread union. Hopefully it doesn't leak ... Below that to the left is the feed water inlet with the check valve installed. To the right is the propane gas valve. Next, I need to run the water lines and connect the solenoid valve, pump, sediment bowl, battery and delay circuit. Finally, I'll connect the propane components, mount the oiler, add oil and water and fire it up.