I did one too, but not so sophisticated and a little difficult for short precise shaft turns:
1. Took some wires, fuse, momentary switch, clip and a pin for connectors
2. Put the wires, clip, pin, switch and fuse together
3. Clipped one wire to battery +
4. Put the pin into cold start relay connector plug, connection no. 86
That was the easiest way I could think of. But precise turns are difficult.
Pawel