I was sick of the Bandit speedo being around 7 km/hr out, so bought a Speedohealer from www.healtech-electronics.com.
A really easy fit. Pop the left sidecover, separate the speedo sensor connector, plug in the cables and run the cable into the tray under the seat. I set mine for -7.0% and had it checked against a calibrated GPS used to check radar units. 50 km/hr indicated was spot on. 100km/hr indicated was 99 on the GPS. Can't ask for better than that!
The device is tiny and you could fit it anywhere. Nice to know my exact speed.
This connector is the one to separate to fit the unit. Simply open, plug in the respective ends and it's done. very much plug and play