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A gear in the transmission drives a flexible mechanical shaft that provides the rotary motion to the speedometer. It drives a dial gear that rotates with numbers 0-9 on it. This dial gear rotates the next one to the left one digit for every complete revolution it makes. This sequence repeats for all the digits.

The speedometer uses a magnet that is spun by the flexible shaft. It rotates inside an aluminum cup. The rotation creates eddy currents in the cup that apply a torque to the cup. The cup is restrained by a spring so the angular deflection is proportional to the speed of rotation of the shaft. A pointer attached to the cup indicates the speed on a dial.

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16y ago

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Does speedometer reading being off affect true gas mileage calculation?

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