Timewise 825
Electronic Speedometer

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The Timewise 825 Electronic Speedometer

The Timewise 825 electronic speedometer meets the strict size and appearance guidelines for use in The Great Race antique vehicle transcontinental rally extravaganza. To the casual observer, the Timewise 825 appears to be an analog speedometer, thereby preserving the appearance of a classic automobile. Internally, however, the 825 is fully digital. A microprocessor driven stepper-motor design eliminates the inaccuracies and stability problems associated with magnetically coupled or fly-ball governor mechanical speedometers. The Timewise 825 exhibits no loss of repeatablity over time and its accuracy is unaffected by changes in temperature or humidity.

The hardware and firmware in the Timewise 825 produce a smooth and steady needle movement. An auto-restarting, linear averaging speed computation algorithm allows rapid response during acceleration and deceleration while minimizing minor speed fluctuations due to rough road surfaces. The digital design provides an extremely accurate and repeatable indication of speed. A fine point analog dial needle and maximum allowable faceplate diameter provide interpretable resolution of 0.05 mph. No other analog reading speedometer provides the accuracy, repeatability, and high resolution of the Timewise 825.

Installation of the Timewise 825 is simple. And calibrating the speedometer for your vehicle is so easy that you can quickly accommodate changes in tire pressure, head winds, altitude, and road surfaces.

The Timewise 825 has been used since 1999 in The Great Race by more than 90% of all contestants. Great Racers have logged more than 12,000,000 aggregate miles using the Timewise 825, subjecting it to high levels of electrical noise, plenty of vibration, moisture, and extreme heat. No other speedometer used in the Great Race can claim the superior environmental insensitivity of the Timewise 825. Its proven reliability has allowed Great Racers to set a slew of records:

  • Lowest championship run score
  • Lowest accumulative score
  • Most aces
  • Lowest single day race score
Photo courtesy of Rally Partners, Inc.
     Please call or email Timewise for pricing and availability.
A special Great Race package price is available consisting of a Timewise 825, a user's manual, a Model 217-15 transducer, 5 ceramic magnets, a 21" DC power cable with in-line fuse, a 3.3 foot DC power extension cable, and USPS Priority Mail shipping. Please call or email for details.

To view the Timewise 825 instruction manual in a PDF formated document, click here. (Latest update Friday, May 31, 2019 )
This 19 page booklet style manual includes detailed specifications, installation, and calibration procedures, as well as a troubleshooting guide. A printed copy of this manual is supplied with every speedometer.

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32 Old Barn Road
Hawthorn Woods, Illinois 60047
United States
Email Jack Christensen at: contact.timewise@gmail.com

This page last updated Monday, March 14, 2022