I found that a bad ground affects the fuel gauge reading. Same effect: turn on the headlights and the fuel reading changes, ever so slowly because the "meter" has a long time delay to smooth out the sloshing fuel when driving. In my case, I couldn't find a ground lug behind the dash, so I added a 12 ga. wire to the ground side of the fuel gauge. I later found that in my 2007 Knight, the ground lug is on the other side of the firewall. Find it. loosen it and clean the mating surfaces with emory cloth, and re-tighten it. That should help.
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Jim (NQ5L) & Chris
2007 Monaco Knight 40 PDQ
2011 Jeep Liberty
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