Jerry I couldn't give two f$%*s about the fuel gauge compared to the error in the speedo. GPS 100km/h Breakout 107km/h!
Unfortunately that's
not something you can make them fix. Standards for speedo's are such that they cheat to the high side to avoid reading low. Reading too low can get you a traffic summons, whereas reading too high doesn't. And of course Harley doesn't believe in tight tolerances, since they often cost more than the plus or minus whatever the supplier ships they usually tolerate. Of course if it bothers you you can fix it; it's pretty easy with the right tuning package. As the tires wear though you'll have to tweak it a bit if you expect perfection.
As for the fuel gauge, glad you don't give a f$%* (or two). Obviously a lot of other people do, or the several threads on the site bitching about the gauge wouldn't exist. Oh, btw, I forgot in my last post to mention reason number three. Running out of gas and stalling while running down the road is also a safety issue. Try it in the middle lane of a packed freeway running at high speed some day. If you survive the experience, perhaps then you will give a f$%* about a lousy fuel gauge.

Jerry