Do you see any way that the second sensor could be mounted upside down and serve to shut off the ATO pump and sound an alarm if the sump level gets too high? I use a Tunze ATO, and have a JBJ on the shelf in case the Tunze ever quits. The second sensor on the Tunze shuts off the pump & sounds an alarm if the sump level gets too high. I'm not sure this could be done with sensor 2 of the JBJ - I think an upside down sensor #2 would have the wire end submerged?