I've got the ElectroDynamics electronic switch on my Brison powered Edge and I don't see how it will work with a magneto engine. It cuts the power from the ignition battery to the engine via an optical connection to the receiver. Since the G-38 does not use an ignition battery, I don't see how any electronic switch that cuts ignition battery power will work. I believe he is going to need a servo to throw a microswitch or hook up a choke servo to kill it that way.