Lexus IS F 2012 Owner's Manual page 152

2-2. Instrument cluster
Instrument panel light control
The brightness of the instrument panel lights can be adjusted.
Changing units for the digital speedometer
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Units for the digital speedometer can be changed between km/h and mph by push-
ing and holding the odometer/trip meter reset button while the odometer is dis-
played. At this time, all the units for the multi-information display will also change.
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Darker
Brighter