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Variable Pulse Width in proportion to the speed your travelling. I have a speedo correction unit that I'm not using any more if you need one!
 

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Color me Gone
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Almost every speedo now uses as Frank mentioned pulses for information. The main shaft will have what is called a reluctor that has a given number of high and low points in it. It will then have a sensor or magnet near the reluctor with an air gap of about .050 and as the reluctor passes by the sensor it creates an a/c signal in high and low points that the pcm counts as pulses. Usually they measure something like 4,000 pulses equal one mile and so many pulses a second equal so many miles per hour. All the correction units do is alter the number of pulses according to your desired change.

I slept at a Holiday Inn last night. :)

Max
 

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I bought the Dakota Digital from Chopper Steve (V.mod) for about $100.
Mounted it by tie-wrapping to the wiring harness on the left side of the bike just behind the rear cylinder and just in front of the storage pouch I have mounted there. It's positioned vertically with the "faster" button on top of the "slower" button.
It needs to be pushed up or down while traveling to change the speedo. I can operate it that way with my left hand without a problem and you can see it even when looking right at it.
 
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