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I've not found any installation instructions for the electric filler cap on the V4.
See https://www.ducatiforum.co.uk/threads/auxiliary-lights.83948/#post-1794632 for details of the original Ducati loom, about £40.
I fitted on on my 1200 and looking at the spare parts diagram for the V4 it looks easier as the cap fits inside a small cover which is then fitted...
I found a link to a very useful document on the Garmin Zumo XT while browsing another forum (ADV Rider). It is a well written and researched...