For those that switched their Magneto equipped Tractors over to 12 volts and also switched their Starter motors to 12 volts with a Starter solenoid, (excellent move) this is the switch you need. This switch is pretty slick. It has a key crank mode but is designed for a Magneto. Shutting the key to OFF will ground the Mag to shut the engine down.  This switch will work for 6V as well as 12V. Heavy Duty unit.