For broader coverage of this topic, see Speed measurement.
An animation of an electronic Aston Martin speedometer's self-test routine, showing how an analogue speedometer hand may indicate the vehicle's speedA Ford speedometer, showing both mph (outer) and km/h (inner), as well as an odometer in milesA modern speedometer in a Toyota CorollaA digital, LCD speedometer in a Honda Insight
A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the early 20th century, and as standard equipment from about 1910 onwards.[1] Other vehicles may use devices analogous to the speedometer with different means of sensing speed, eg. boats use a pit log, while aircraft use an airspeed indicator.
Charles Babbage is credited with creating an early type of a speedometer, which was usually fitted to locomotives.[2]
The electric speedometer was invented by the Croat Josip Belušić[3] in 1888 and was originally called a velocimeter.
^Harris, William (10 July 2007). "How Speedometers Work". auto.howstuffworks.com. Retrieved 30 January 2015.
^Lester, I.E. "Charles Babbage and the Difference Engine". NewMyths.com. Archived from the original on 3 August 2020. Retrieved 30 December 2022.
^Sobey, Ed (2009). A Field Guide to Automotive Technology. Chicago Review Press. p. 78. ISBN 978-1-55652-812-5. Retrieved 30 January 2015.
A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they...
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instruments (such as micrometer, barometer, thermometer, tachometer, and speedometer). The contrast is even more obvious in countries that use the American...
the dashboard. This system calculated ground speed from the rotating speedometer cable and used a bi-directional screw-drive electric motor to vary the...
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by the C-series to lock the speedometer needle despite the P-series having a tachometer in place of the second speedometer. Despite this, the pin and wire...
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bearing 1992.5–1997 2WD Gear drive speedometer in tail housing (Some 1998 may have gear drive) 1998–UP 2WD no speedometer gear (VSS in axle) All Years have...
parameters in the vehicle, often found on its control panel or dashboard. Speedometer Tachometer Odometer Trip odometer Oil pressure gauge Coolant Temperature...
and μέτρον (métron "measure"). Essentially the words tachometer and speedometer have identical meaning: a device that measures speed. It is by arbitrary...
suspension, wheels, tyres, and brakes. The CD200 featured a square speedometer, large front and rear mudguards, twin chrome exhausts, a choke tucked...
the Philippines which use meter. Measuring devices (such as ammeter, speedometer) are spelled "-meter" in all variants of English. The suffix "-meter"...
Magneto starter, running boards and room for five. Options included a speedometer, clock, and a full glass windshield. A limousine version was priced at...
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