I have the speedohealer and they are extremely easy to install.
First, pull the rear seat, front seat and tank off of the bike...
Then locate the speedo sensor on the side of the counter sprocket cover and follow the wire up to the connector in the harness.
Speedohealer states that Kawasaki puts the signal wire and the power wire in two different places on the 636, dont know if the 10 is the same or not but I had to use thier wiring diagram to find the right wiring hookup and then push the pins in place.
Once you get the pins in the connector if needed unhook the factory connection and plug them both into the speedohealer.
Once plugged in do the setup diagnosis to make sure it is set up and hooked up properly.
Once you are sure it is set up right find someplace to place the "brain". I put mine on the front side of the main spar that the swingarm mounts to so that I can get to the memory recall switch and the dip switches.
Secure unit then go to speedhealer.com and use thier calculator to find out what correction you need. You can do the actual distance vrs true distance, real speed vrs indicated speed it doesnt matter, the more accurate the better and the more time it will save you in the long run.
If you have a gps or can get your hands on one either that or get someone to follow you in a car with stock size tires on it and then that will give you the actual vrs indicated. THe gps will work also doing the same or you could run mile markers. If you do the mile markers then do at least 10 or 20 miles. I would find a spot where you can stop and reset your trip meter then start you milage run. Stop at the end of the run and make note of what you have on the trip meter vrs what you actually did.
Go to thier site and click on calculator and plot in your numbers and it will give you the correction factor. Print the instructions and it tells you exactly how to program the unit. Program it and enjoy your newly calibrated speedo.
I tested mine on the dyno and it was 100% spot on all the way up to 120 on the dyno. Now It is fun to ride next to bikes that are off and see how far they are off and then laugh at them when they are putting along when they are really 15mph under the limit.
Have fun and enjoy...