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Old 08-29-2003, 05:21 AM
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wjm wjm is offline
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
Building and electronic speedometer adj?


I recently built a "DIY code reader" using schematics from folks on this site. It was fun and works great.

Now I'm wondering how hard it would be to build an electronic speedometer adjuster. I know that these are currently available for sale for those whose guage is off due to diff or tire changes.

My understanding is that an electronic pulse is sent along a wire to the speedometer. It is this signal that needs to be modified.

Any thoughts?
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Old 08-30-2003, 03:08 PM
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wjm wjm is offline
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
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Old 08-30-2003, 05:58 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Like you say they are available.

The pulses are a DC square wave, with "X" being the number of pulses that makes 60mph. Intercepting this signal and electronically altering it to X-yX where y is a constant should be simple enough to do electronically.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 08-30-2003, 11:21 PM
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Join Date: Jan 2001
Location: oregon
Posts: 2,013
You could set it with a GPS , a friend checked both my SD and SE with his and both speedo's were right on.It is a nice thing to know in areas know for speed traps........
William Rogers.......
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