If I were to wager, I'd bet on the interior monitor being the one that is off. The sensors for the monitor in most RV's are notoriously inaccurate.
Your outside gauge reads 1/3. If it were me, I would go and have it filled and see how many gallons it takes. Then check the gauge and the monitor see where they stand.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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