Whilst we're at it and since my english isn't what it used to be, here's a diagram of the switch I intend using.
I presume the + goes to "supply" via a fuse. The electrons will when the switch is on, go out from "load" to the ignition modules and the + of the starter relay.
Is that correct?
Interestingly, the ignition boxes, standard Bosch units apparently have no sticker with a number and what may have been a number engraved on the side of the boxes, which is what I have on the Electronica, has been filed off. Maybe special boxes of some sort?