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Can Benz 1982 transmission 300d Speedometer mechanical - electrical?

The speedometer in a 1982 Mercedes-Benz 300D is fully mechanical.

The speedometer cable is driven by a gear on the transmission output shaft. This gear turns a worm gear, which in turn drives a speedometer pinion. The pinion meshes with a gear on the speedometer head, which causes the speedometer needle to move.