Holes drilled and lights stuck in place with "No More Nails" double sided FOAM backed tape. No onto the wiring loom. I've been having a think about this and I plan to run a +12v/0v pair to the Dome light, even though at this stage I do not plan to take the earth from there having a spare wire up to that point could be useful if later the lights don't work as desired off the switched 0v on the tailgate switch. So a pair (I'm using a lightweight 0.5mm plastic sheathed main cable) is to be run from the dome light, over the roof lining, down the umbilical and into the upper tailgate and to one of the lamps. From there I will run individual cores and spiral tape them to the existing harness across to the other light, and from there extend only the 0v wire to the door closed switch on the tailgate to provide the switched ground. Each LED is 1.8W (3.6W total) so with the extra 3.6W/50% added to the traditional bulb load of 8W there is a risk of stressing the circuit (the electronics ramp up the volts to the light). To counteract that I will either see if a 5W bulb or a LED replacement for the 8W OE bulb can be fitted - this should keep the load close to the original 8W design.