mittarivaihteen
Mittarivaihteen, meaning "speedometer gear" in Finnish, refers to a component within a vehicle's transmission or drivetrain that is responsible for measuring and transmitting the vehicle's rotational speed to the speedometer. Historically, this was often a mechanical system. A small gear, typically made of plastic or metal, would be driven by the output shaft of the transmission. This gear would engage with another gear, which in turn drove a cable. The rotating cable would then transmit the motion to the speedometer head, where a mechanism would translate the rotational speed into a display of the vehicle's speed.
In modern vehicles, mechanical mittarivaihteen systems have largely been replaced by electronic ones. Instead of a