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The speedometer is calibrated for stock (16/40) final drive ratio.
Change any sprocket (front or rear) and your final drive ratio is off.
The Speedo-Healer interconnects between the speed sensor output from the engine to the gauges.
I've heard you can get quite accurate readings with these units if set in conjunction with a GPS.

As a side note, the Ducati 999 has it's speed sensor at the rear wheel.
So about the only way it's calibration can be off is if a taller tire is used, such as 190/55 vs. 190/50.
 

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Am I correct in assuming that the odometer is calculated by the speedometer from the vehicle speed sensor and not from a separate source?
So if I install a Speedo healer it will correct the odometer reading as well?
The speedo and odometer receive their input from the speed sensor located at the rear of the bike.
It's a hall-effect sensor that generates rotation pulses from the counter-shaft.
Those pulses are then used to calculate speed & distance.
The Speedo-Healer interconnects between the sensor and it's destination, and allows modification/correction of the pulse count output.
So yes, it should not only show accurate speed, but accurate odometer readings as well.
 
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