I changed mine out to keyless last off season. I started with taking photos and explanations and then it all stopped once I ran out of time.
The main thing on my 05-06 ZX-6R, which I think it true for most bikes, is that you need to check the wire that goes from your ignition to the ECU. Many have a voltage drop which required a resistor....argh, can't remember which one and I can't compute V=iR at the moment. Anyway, I found various directions on how to do it online and none of them helped.
You just need to take the switched power coming off the ignition and route it to your kill switch. Off the kill switch, you will have the resistor inline going to the ECU, and then full power going ....somewhere.
I am really sorry I don't remember. I wasn't going to reply because I didn't really have much good info but no one replied yet.