http://www.mfgsupply.com/m/c/31-8786.html

Here is the link you need, and it is simple to install.
Just cut the wire from the breaker points and splice the hot lead of the module to it, and the negative lead from the module to the side of the engine.
With breakerless, just add the module hot lead to the kill switch lead, and the neg, to the engine side.
It costs 12.00 dollars, with six dollar shipping.
It does comes with full illustrations, and instructions.
Butch