I had to research that one.......
On my tank it could be installed in one of four positions.... where the Full indicator is at 3 o'clock, 6, 9 or 12. That means a potential of a 25% error if not positioned properly.
I found this video that explains how the tank level and manual gauge vs electronic gauge works.
Based on this video, I'm going to assume that for a horizontal tank should have the gauge / sending unit where it is readable such that the Full indicator is 3 o'clock.
From what I found reading more about the sender is that it works based on resistance. Most of the horizontal tanks used in RV's require a sending unit that is based on a 0 to 90 Ohm reading. As the float inside the tank moves the resistance changes and that results the level reading inside the coach.
So if the readout is no matching the actual amount of propane in the tank it would either be a problem with the float or a bad sending unit.
The sender on my tank is this one.....
https://www.amazon.com/Manchester-Ta...09373264&psc=1
So after all that..... I'm not sure there is an adjustment for the sending unit.
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