The speedometer cannot measure distance or speed directly, it "counts" the revolutions of the drive shaft in the gearbox housing and converts them into kilometers. The size of the tires and the gear ratio of the main gear determine how many revolutions the speedometer shaft must make in one kilometer. The corresponding adaptation of the speedometer drive is characterized by the gear ratio "distance - number of revolutions".
In the speedometer produced before July 1981, the speedometer shaft (1) is secured to the instrument with a knurled nut. The latest version has plastic retaining clips (3). Position "2" - sealing bushings.
Speedometer malfunctions
A shaking speedometer needle usually indicates that the shaft is rotating with binding.
In a car that develops high power, the speedometer drive in the gearbox may be worn out.
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