It's an easy-to-use, elegant Android application to display a speedometer in Pokémon GO or any other app of your choice!
Visit Google Play Store to download Poke Speedometer to your Android device.
After downloading and installing, launch the app. The home screen appears, you can change your settings here and choose in which apps you want Poke Speedometer to show up. Poke Speedometer will show and hide automatically.
You can also set a speed limit (defaults to 10.5 km/h), to alert you when you go too fast for Pokémon GO.
For more detailed instructions, visit 'How to use'.