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How Speedometers Work

By: William Harris  | 

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­Related HowStuffWorks Articles


  • “100 Years of Speedometers — The History of Driver Information,” November 7, 2002. Found online at:
  • “Automating Speedometer Calibration,” by Ganesh Devaraj, S.B. Rajnarayanan, A. Senthilnathan and S.R. Anand. Evaluation Engineering. Found online at
  • Encyclopedia Britannica 2005, s.v. “eddy current.” CD-ROM, 2005.
  • Encyclopedia Britannica 2005, s.v. “flexible shaft.” CD-ROM, 2005.
  • Encyclopedia Britannica 2005, s.v. “tachometer.” CD-ROM, 2005.
  • Erjavec, Jack. "Automotive Technology: A Systems Approach." New York: Thomson Delmar Learning. 2005.
  • “From speedometers to modern instrument clusters,” by Gerhard Wesner. Automotive Engineering International, January 2005. PDF download at
  • Inner Auto Parts Web Site:
  • Tire Size Calculator
  • The National Watch and Clock Museum
  • Siemens VDO Automotive Web Site