Honda GOLDWING GL1800/A 2015 Owner's Manual page 25

Gauges & Indicators
Lights as a reminder to refuel soon. The indicator comes on when there is about
1.16 US gal (4.4 liters) left in the fuel tank. Lamp Check.
Shows the approximate fuel supply available, if your motorcycle is on a level
surface.
At F (Full) there are 6.6 US gal (25 liters), including reserve supply. When the
gauge needle enters the red band, fuel will be low and you should refill the tank
as soon as possible. The amount of fuel left in the tank when the needle enters
the red band is approximately 0.79 US gal (3.0 liters).
Shows engine coolant temperature. When the needle moves above the C (cold)
mark, the engine is warm enough to start riding. If the needle approaches the H
(hot) mark, pull safely to the side of the road. See
cautions.
20
Instruments & Controls
low fuel indicator (amber)
fuel gauge
coolant temperature gauge
page 241 for instructions and