Come on guys...7 years ago??
IRC It's a simple pivot switch like in the picture so it goes in so when it pivots down it breaks circuit. Think it was a N.C. (normally closed) position mount...that would be like jumpering. You can check it with an ohmeter up/down, it seems like if the fluid drops and the arm drops that was the way it worked.
Love my AQH but the leaky neck work around, this float thing, thermostats, in/out pex links, plus normal annual maint. Kind of answers the "what do you retired guys do all day"? Either learn to fix it or dump a bunch of dollars in a shop somewhere hoping you find a "tech" that can really fix it right the first time.
Off to the new Girard motor project next.