i found where the problem lies, and what a flimsy mechanism they used for the neutral light
on the gear lever it has a bush with a lobe on to move a piece of thin metal to make contact with the switch
you basically have to "align" / bend the metal enough so it stays off when not in neutral and to go on when in neutral
very close tolerances ...
I managed to fix it a little, but still goes off now and then when it is in neutral
need to tamper a bit or or when i have time to make a better mechanism
thanks for the replies
Cheers
Marvin