where do I get one and how much are they? thanks in advance for the replies.

Thanks Bad_Max, are they all the same?, as it doesn't matter what bike they are for.

Speedo Healer V4.0 Complete Kit Fits All Motorcycles

Speedo Healer V4.0
On most modern motorcycles, with factory speedometer error being as high as 10%, even a modest sprocket gearing change can have the speedometer off by 15%. The sprocket change will also cause higher odometer reading, creating a negative resale factor for no valid reason. The SpeedoHealer is an inexpensive, convenient and very simple way to fix your speedo and odo. Compatible with all motorcycles with non cable driven speedometer.

Includes:

1. Control Unit model:
SpeedoHealer v4.0: standard model with built-in button

2. Harness Kit (Please choose from the dropdown)

Just the harness is different... This one should work the easiest..

Hi.
The SpeedoHealer model that is needed is the 'SH U01', which is basically the universal one. Search the treads and you'll find excellent install instructions.
AJ.

Got it, thanks again, J.B.