Fuel Guage

[SportsterDoc]

Generally, yes,... it also might be mechanically stuck (interference) from 1/2 to full tank, while working OK from 1/2 to empty.
If I remember correctly, fuel pump ass-y unit has a 4 pin square black connector.
How about 1/2 - 3/4 fill and shaking CB sideways , and then top it up, as a very simple test, without electrical knowledge. I do not think meter will show changes while shaking.
So try it if you want, does not cost anything.

I think the signal is buffered and needs time to change.

My 2014 standard is very consistent:
Each segment is about 0.6 gallon, until the last segment.

I did not follow Johnny's "issue". Did it still read "1/2" (3 segments) after completely full?
If so, float rod is likely obstructed or damaged, especially if something thrust into its path.

The dealer can probe the voltage output.