Speedometer

The Speedometer is a feature that shows you how fast your kart is accelerating. It appears on the bottom right hand corner of your game screen in Mario Kart: Double Dash!!. It is able to be toggled on and off in Mario Kart 64.

Trivia

 * A speedometer was going to appear in Mario Kart DS, which can be seen in some early screenshots but got removed in the final game.