Honda 2003 ST1300lA Owner's Manual page 20

Gauges Indicators
&
Shows riding speed in miles (USA) or kilometers (Canada) per hour.
Shows engine speed in revolutions per minute (rpm).
Shows excessive engine rpm range (indicated from the beginning of the
tachometer red zone) in which operation may damage the engine. Do not let the
tachometer needle enter the red zone.
Flashes when either turn signal operates.
neutral indicator (green)
Lights when the transmission is in neutral.
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Instruments & Controls