Installed Horst probes in my black water tank, this spring, no big deal. My tank was located just in front of wheels on the right side(passenger), under commode. The probes were at the rear of the tank, closest to wheels. They worked really good at first, now the first two lights stay on, hopefully this is temporary, maybe tissue only time will tell.
Just follow instructions on removing old ones, you will be surprised of the gook on them.
Scottz diagram is just like mine.
Still recommend them to my friends.
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