Neutral switch wiring.

I need to rewire the neutral switch on my 75 Commando. The bike has a new wiring harness and the color codes are all over the place. The still original wires coming off the switch on the transmission are: green and green/brown. I need to wire this switch up to the neutral light.
Any help would be greatly appreciated.

It should work either way but green should be the wire coming from the neutral light to the switch. The other wire should be red or at least plug into harness red. So there should be a harness green with a red in that area.

Note that the wiring colours for the console lights on the Mk3 wiring diagram are wrong as they are the same colours as the harness, therefore the neutral light wires should be white (from the ignition switch) and green.