You guys got it quicker than I thought.

Yes it is a float bowl sensor so you can set it up to warn or cut off your motor should a bowl go dry. I know of some guys that made homemade ones like this but nothing mass produced.

One guy I know is already thinking about getting this and then building some circuitry so that if the bowl goes low it ups the speed of your fuel pump to fill it back up.

Dang ole' carb guys abd their bag of tricks.