Good to hear on the ignition. Not sure about the green where it should be yellow, but looking on some picture of Raywood, his may had the same thing.
I know the one green that is on #4 at the 8 pin should go back to the neutral switch. The green you have for the tach, not sure where it goes, but looking on the schematic that Mickee put on it may go to either Pin #11 going to the PDM, or pin #6 on HCI #2 connector.
Also maybe BDPP can look at one of theirs and see what is up with the color change and confirm.
Worse case if you can not get it traced. put it all together and disconnect the nuetral switch, turn the power on and it should not show a neutral when it is n. If it does show neutral with siwthc disconnected, the green may be switched, if not then started and see if the tach sweeps once started, if it does shut her off and then reconnect neutral switch. Then turn key on and with power on but not started, see if she now indicates neutral! If it does, pretty much confirms which green is doing what.
Good luck