Bike cable and shifter, ran to where my cruise control cable would go to. Having no cc makes it easy. Shifter is nice b/c you can also use it to lock the throttle high if you are using the winch or on board air.
I don't have pics of the engine, but it's easy. Just run the cable to the throttle, then find a way to connect it.
Some people use the chain that dog tags come on (the little *****) so as to prevent hte throttle from ever sticking.