The Fazer has computer that sends specific signals, the speedo, rev counter and throttle position sensor are all linked so changing the speedo will cause you a lot of headache with RPMs and confused computer. The speed is measured against the revs and the position of the throttle. This info goes to the black box mounted just in front of the rear light on the mudguard.
The safe thing to do is to get from Christian here on the forum that has created Multi-Gauge
http://foc-u.co.uk/index.php/topic,13218.100.htmlthis is digital thingy that replaces the Fazer fuel gauge and shows digital speed and much more:
The Multi-Gauge displays various information at once, the layout of which can be configured by choosing from a set of view modes. The latest SW-version provides the following:
Gear: The currently selected drive gear, including Neutral. Calculated from the given rpm and speedo signals.
Fuel: As the Multi-Gauge replaces the original fuel gauge it has to display the level of the fuel tank. Shown in numbers or as a bar. Corrections are applied to compensate for the tank geometrie and to reach maximum accuracy. A warning LED serves as low level indicator.
Water temp: The current temperature in the coolant system. The orignal sensor signal is used.
Air temp: The current ambient temperature. Provided by an extra sensor that comes with the gauge.
Battery: The current system voltage, taken from inside the dashboard.
Speed: The current speed, taken from the speedometer signal and corrected by an (adjustable) factor and a speed dependant wheel slip. Readout in KM or MPH.
Speedometer correction: The multi-gauge is capable to apply a correction factor to the speed signal and feed it back to the analog speedometer and odometer.
Acceleration: A timer starts automatically with the first move and counts up to a definable speed or distance (e.g. 1/4 mile).
Stop watch: Start/stop or laptime for use on race tracks, controlled by a (extra) button at the handlebar.
GPS data: Displays the data from an additional, external GPS receiver (speed, height, course, time, etc. ).
The GPS receiver is not part of the package.
Gear shift indicator: The warning LED starts flashing if a certain rpm value is passed. A second (higher) rpm value can be defined for permanent light. Each gear can be set individually.
Of course the display cannot show all the information at once. Therefore the user can choose from a set of predefined viewmodes that set the bits of information in different arrangements.
http://cvieth.bplaced.net/ganganzeige_summary.html
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