85 and 86 are your coil wires you need to run your input on one side and ground on the other 30 and 87 is the control wire you just need to splice in what ever it is that you want to control across those 2 and that is the switch for it
that diagram is just how i said it except it is showing a 2 position relay which is 87a other then that it is the same i just might not be explaining it as well as a picture does