This was the guy I ordered from...
Despite being from Lithuania it was sent quickly and the guy was helpful with query replies in English. He sorted out the plug pins for me and sent a diagram re powering up from a stand-alone 12v... I didn't retain the diagram though.
The version I bought was slightly cheaper as I just had the one smaller connector but it seems now he's selling it with a Y lead and second connector to fit older Suzukis too.
Re the 12v external power... you do realise this isn't needed on a manual start model unless the OB is dead... normally you do all the diagnostics running.