eddy
very simple.
for the engine there is 2 wires - usually BLK and RED.
BLK is the ground wire which connected to engine body/frame and the RED which "leads" the current from the magneto to the capcitor and from there to spak plug.

2 ways of using the KSW.
with the micro SW NC(normaly close) or just withthe regular on/off SW

the main conceot is to control;l the power/current to the capaitor meaning if the circuit is closed than u will get a spark all times the engine truning, the second you have open the circuit on pwoer to the spark plug' hence no spark - engine cut!!!

the KSW have 2 featurs, SW ON OFF and a NC SW that can assmebled inline to the TH servo so while you go the the TH cut endpoint the servo arm will hit the NC SW and will open the ciruit.
the other SW is inline to the NC SW - this is for saftey reasons so while you on the ground iven when your radio is off u can still start the engien becaus eit have its own generaotr - magneto!!!


hope that help on some way

wellcome to the GAS world!