Thanks. I'm finding that to be so true. I was unable to get plumbing schematics from Thor. All they could provide was an outdated electrical schematic but enough to get an idea of some of my wiring. It's an older rig as well so at almost 2 decades old I might consider a newer set of sensors down the road.
What really tripped me up was the sensor reporting an empty tank when in fact it was full. For some reason it starting reporting the correct level in the past few days. Very troubling to be sure as it was the black water tank! See my Oh Sh** post on Maint and repair forum.
Again why would Thor label Tank 1 for number two use and Tank 2 for number one use??