It's a Rally one.
Nah, the speedo pick up only fits into one.
Looking at the clues.. it's definitely the one for the fuel guage. They've (conveniently) made them all 'one fit', so the inept can't fuckit up. Thus:
All connected up.. apart from the speedo one, which is already through the fork:
They've not even made the wires matching colours.
Edit.. short nails are no good when you've put your screwdriver down, just out of reach
And, obviously, nobody at SIP answers emails.