Instruction book AUDI A1
 Audi A1   Controls   Instruments and warning/indicator lamps  Instruments
Overview of instrument cluster
Fig. 1 Overview of instrument cluster
The rev counter indicates the number of engine revolutions per minute.
You should select a lower gear if the engine speed drops below 1500 rpm. 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, it is advisable to change up a gear or move the selector lever to "D" (or lift your foot off the accelerator) before the needle reaches the red zone.
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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