How do you display digital speedometer in clock info display on Opel Astra G?

To display the digital speedometer on the clock info display of an Opel Astra G, turn on the ignition without starting the engine. Then, press the "Menu" button on the dashboard until you navigate to the "Speed" option. Select it, and the digital speedometer should appear on the clock display. Note that the exact steps may vary slightly depending on the model year and trim.