If you think the sending unit is giving you false information - I would recommend removing the sending unit for inspection. Sending units are usually a slide contact pad or a magnet contact. The magnet contacts can break loose from the fuels eroding the glue point and the magnet goes rouge on ends up in the wrong places. The slide electrical contact style become corroded with fuel additive build up and the contact loose the electrical connection in the corrosion area.
If you feel the bike is running low on fuel before it should - then I would remove the fuel petcock valve assy, and inspect for build up of debris stopping sufficient fuel as the fuel level gets to that point. Could be as simple as a collapsed filter screen.
Check it out and see what is going on in there.
Life without Motorcycles would just be boring, really boring