Chuck_S wrote:
Horst probes in mine the past 6 or 7 seasons. They occasionally show a fuller black tank than is the actual level but they rinse well.
The diagram above is how they're wired. I just replaced the probes one at at time so there was no doubt what wire went to what probe. I needed a thin wrench to get the nuts off. Just ground down a cheap open end wrench to squeeze in.
-- Chuck
Chuck has the solution. I installed the babies five years ago and the have done an excellent job. In fact, I'm putting in a set for a camping buddy of mine this May. By the way, they are not that expensive either.