New LML engine in old Vespa

Hi,

Probably asked before, but... I have a '65 Vespa 150, just purchased a new LML 150. I have the old wiring in the frame. Two wires from the engine - blue and black. Three connectors in the voltage regulator - marked black, silver and yellow.

I guess black-to-black motor-regulator-frame (ground)? The blue from engine - to which of the others on the regulator? And from frame to regulator - do I connect all (except black) to the other connector?

Appreciate help.

Regards from Norway