As the MMC don't use the same colours in the wiring consistantly, far safer to test with a voltmeter or even just a simple test bulb & wire
one will be constant live feed to the switch, then in position 1 on the key another will be live ie ignition, then when you turn to the spring loaded 'twist' another one will become live to trigger the starter, this is the one to remove from the keyswitch and feed via your push button (if you leave it through the keyswitch you will have to twist & press together)
