Good switch, nice package, but still, with the slight movement in the treadle it takes on the Hydrostatic transmissions, you're long gone before the beeper ever starts making any noise. The thing with a standard stick that makes it easier is that you have to have the clutch pushed in before you move the stick to reverse, so a microswitch on that stick isn't hard to do. I suppose you could make an adjustable bracket for the switch in your link, and keep tweaking it until it turned on the horn with the slightest pressure going backward, but then it would be a pain to keep it from beeping all the time. I just wish there was a way to externally sense reverse clutch pressure on these critters. With a pressure switch, it could be easily tweaked in to pickup on any reverse clutch pressure, and make it squawk before the tractor even moves. But, looks like it's gonna have to be something super sensitive mechanically. Still thunkin' on this problem. Just wish I could get my tractor in out of the cold so I could study this a bit more. It's Alabama Winter at the moment (just under 40F with drizzling rain) which lasts a week at a time. Not all that cold, but absolutely miserable when you can't dry out and warm up.
Maybe I give that pressure switch idea to Kubota and they make me a millionaire? One can dream, right?