He has a 1000 which has a speed sensor down near the clutch slave. The Wee uses the front wheel which is better with regards to gearing changes since it is, as you stated, unaffected by changing sprockets.I think our mate from down under was pulling your leg, marble townsman.
The speedometer is driven from a wheel, so the sprocket and the position of the gearshift have no effect on the speed displayed. Understand that our stock speedometers are none too accurate at highway speeds.
That does clear up my confusion regarding Keith's reply. Having the speed sensor read off the smaller front sprocket would result in a higher reading (as the front sprocket is now spinning faster for the same speed). Anyway, what do you guys think in terms of a solution? I would really like to know how fast I'm going. I really don't need any more speeding tickets!