@morich just saw this thread.
My non contact sensors are horrible. I can empty the tanks and the sensors can show 2/3 or full, then wait 30 minutes and they show empty, only to show full 30 minutes later.
I have read that there are cold solder joints on the control board for these systems and that removing and touching up the solder joints can improve the accuracy a lot.
Many that do this also drill holes in the face of the panel to make the adjustment pots accessible.
I plan to give it a go later this winter when I have some time.
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2007 Winnebago Journey 36SG and 2013 Honda CRV Toad
e-Trailer XHD Towbar (Demco) Blue Ox baseplate, SMI Stay N Play brakes
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