2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 548Get this manual
LIGHTSMETERSSWITCHES Move the float to th bott om IRESERVEl posit ion, turn the ig nit io swi tc to ON and check the fu el gaugeSegment and low fue indicato sho uld blink
FA modelOW FUEL INDICATOR
FGA od el:
If th fue gauge doe not fun ct ion propertycheck he lu ellevel sensor (page 23-12If the fuel leve sensor is OK, replace the co bina tio meter, If all eeqrnents bl ink duting inspectio n, repl ace th e
combination meter Turn th ignition sw itc OFF