Yes, Mark (Itgoes) put me on to the model and he & Jim (jfeagans) helped me through the install. Speedohealer is an electronic device tho and the Gen I set up is mechanical so it isn't adaptable. Only way I can think of to change the speedo readings is by exchanging drive hub internals with a different Yamaha bike which shares the same housing with different gearing. The Thundercat for example (which is what I used when switching to 17" radials once)
Don't believe there is any way to calibrate the oem speedometer.