Yup. GEO method, single ply, and fiber here too. (TMI?)
I don't know about the sensors.. I've never bothered to check them, but I've never had issue one with my black tank.
One thing I have always done though is to fill my black tank a good 1/4-1/3 full with water and solution after a dump. Nothing scientific to say it makes a difference over the "5 bowls full", but I've never had a "pyramid" or stubborn solids when dumping. It's probably just in my mind that things break down a lot quicker with adequate water from the get go.. versus adding copious amounts of water as you flush. That is still important too, but flushing into a large "medium" seems to work for me.