Instruction book Audi RS3 Version year 2014
Audi RS 3  Controls and displays  Instruments and warning/indicator lamps  Instruments
The rev counter indicates the number of engine revolutions per minute.
It's a good idea to keep an eye on the rev counter and gear-change indicator because you can minimise engine wear by driving at moderate engine speeds.
The start of the red zone on the dial indicates the maximum engine speed which may be used briefly in all gears when the engine is warm and after it has been run in properly. However, on automatic vehicles it is advisable to move the selector lever to "D" (or lift your foot off the accelerator) before the needle reaches the red zone.
In general it is best to avoid high engine speeds and to follow the recommendations given by the gear-change indicator. For further information please refer to Link.
Caution!
The rev counter needle -1- Fig. 1 must only ever briefly go into the red zone on the scale; otherwise there is a risk of engine damage.
For the sake of the environment
Changing up a gear early will help you to save fuel and minimise engine noise.

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