MarTek Electronic ignition wiring question?

the unit on my kz900 is one of the optical ones, but i will be around the bike tomorrow and will look at what wires i have where. i dont know much about it. it was there when i got the bike. and there is limited info about them. they must not have been a very hot item...

back in the late seventies and early eighties they were the hot ticket them and the boyer-brandson ignitions then dyna came out with the dyna 111 and everybody sort of got shoved to the wayside a few bad reports by people and they were done pretty much. they were way ahead of there time as far as i can see even ahead of the factories.