That's just my best guess by the way the meter is set up and it's range.
1 2 3 4 5 6 7 8 9 meter LED's
8 9 10 11 12 13 14 15 16 voltage range
I found this on the Kuryakyn site. It doesn't make sence to me, given that the stated range and number of LED's is 1:1, but I didn't design the thing!
Our L.E.D. Battery Gauge is an array of L.E.D.’s indicating the operating voltage of the bike’s electrical system.
Green L.E.D.’s represent the normal operating range of your charging system, 12.5v to 14.5v. Amber L.E.D.’s warn the rider that the bike is not charging. If the reading drops below 10v or exceeds 15v, a flashing red L.E.D. will alert
the rider of an impending stall or the possibility of damage to the battery &/or sensitive electronic components on the motorcycle.