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A lot of folks will tell you the sending unit; I'm on the 3rd fuel gauge on my '02 RG. You can test the sending unit with an ohm meter, but you gotta pull it to do that. Which if you're due for a fuel filter replacement would be OK, otherwise it's an additional expense and PITA. It's easy to replace the gauge.
Have you just returned to riding after the bike has been sitting for months? My fuel gage was giving me fits for a couple of months after being warehoused over a year. Its accurate again (as well as it ever was) after riding a few thousand miles.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.