TOYOTA 2011 Tundra - Manual (Page 218)

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2-2. Instrument cluster
Vehicles without multi-information display (type A)
Vehicles without multi-information display (type B)
The following gauges, meters and displays illuminate when the
engine switch is in the ON position.
Tachometer (if equipped)
Displays the engine speed in revolutions per minute.
Speedometer
Displays the vehicle speed.