Keith, those OEM sensors are notorious for not working accurately from the day they were installed. I understand that there may be a way to "calibrate" the readings behind the panel in your motorhome. I can't, however, tell you how to do it.
There are aftermarket sensors that have been reported to perform better. I have seen some very favorable reviews of the SeeLevel sensors, but they are pricey. They are strips that mount on the outside of the tanks and use your existing wiring.
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Tom and Barb
'07 Winnebago Voyage 35L
Workhorse W22 chassis FMCA 219315
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