I have to agree with Wayne on the tank sensors with the exception of the fresh water. No matter what parameters you load faulty data from the senders makes them irrelevant. Not just a Keystone issue. I have seen the same on all RV's including the expensive class A's. Experience will tell you when tanks need emptied. I wouldn't spend my time pursuing this but it's your time use it as you wish.
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2006 3000RK
2009 Ram 2500
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