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Some speedometers have a cable that connects the drive gear in the transmission to the drive gear in the speedometer. The cable can break or the gears can strip.

Some speedometers have a wire that sends an electrical signal from a sensor in the transmission to an electronic head unit. The wire can break, the connector can fail or become disconnected, or the head unit can fail.

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Q: What is the problem when the speedometer drops while driving?
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