Honda CIVIC HATCHBACK 2018 Owner's Manual page 121

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Shift Up Backlight
Shift Up Backlight
* Not available on all models
Blinks when the tachometer reading
approaches the red zone.
uuGauges and DisplaysuGauges
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1Shift Up Backlight
You can use the customized features to turn the shift
up backlight blink feature on and off.
2 Customized Features P. 133, 348
119