An electronic speedometer calibration device includes a microcontroller and an entry device. The microcontroller receives an electrical speed signal from the speed sensor. The microcontroller is instructed to change the frequency of the electrical speed signal by some multiplication factor. The multiplication factor may be entered through a keypad, a computer download, or through any other suitable device. The multiplication factor is preferably shown on a display device. The multiplication factor may be greater than or less than one. The microcontroller will output an electrical speed signal to the electronic speedometer with a frequency which has been modified by the multiplication factor. The speedometer will display the corrected speed. A second embodiment of the electronic speedometer calibration device includes a digital frequency multiplier and a digital frequency divider. A third embodiment of the electronic speedometer calibration device includes a frequency to voltage converter, variable gain amplifier, and voltage to frequency converter.
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