Guys I would like to make a final statement on this following testing.
There are 6 pins in the connector, 4 across the top and two at the bottom. I have used a naming convention as you look at the pins in the open connector space.
Top far left: +12V when reverse gear is engaged, 0V otherwise.
Top left: A fluctuating voltage which ranges +0.3 < V < +0.8 when ignition is switched, 0V otherwise. No idea what this is for.
Top right: +1.3V with sidelights, 0V otherwise. Again, not sure what this is for.
Top far right: +12V with sidelights, 0V otherwise.
Bottom left: +12V constant from battery.
Bottom right: +12V switched with ignition, 0V otherwise.
To find a ground source, there are bolts that hold the pull levers for fuel cap and bonnet behind the plastic trim which you can route a wire to easily enough.