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  #1  
Old 08-29-2003, 06:21 AM
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wjm wjm is offline
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Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
Building and electronic speedometer adj?

Folks,

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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  #2  
Old 08-30-2003, 04:08 PM
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bump
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  #3  
Old 08-30-2003, 06:58 PM
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Join Date: Mar 2000
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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.
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Continental Imports
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  #4  
Old 08-31-2003, 12:21 AM
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Location: oregon
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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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