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The speedometer cable is connected to the gearbox output shaft, the
transmission shaft, or differential. The rotation of these shafts is
used to measure the speed and record mileage. This information is
sent back through the cable where it is recorded on the speedometer.
The speedometer and odometer are driven by a cable housed in a
flexible casing. This cable is connected to a gear in the
transmission. Speedometer cables break as the result of age, lack of
lubrication, or because the cable casing has sharp bends. It also
breaks from too much friction in the speedometer head.
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