Vespa GS150 VS5 Flytech W/O battery

Ciao,
I bought Pinasco Flytech for my VS5 and I would like to connect it without battery and use the original switch as kill-switch.

Do you have any scheme or manual how to connect it?
Im not stong in electric and Im not able to connect it with original switch correctly.
Start/CDi circuit is OK.

Danke, Dave