I had a company called rhino installs fit aftermarket cruise to my 2012 3.0 Euro 5, it is can bus, the wiring just plugs in line to the speed sensor pulse wire loom I believe which is low down behind the lower dash panel near steering column and pedals, although on the 2011 on build they changed the plugs on the loom and possibly the loom itself as the fitter had to create a loom to fit. All done in an hour if I remember correctly and it was minus 3 I think temp he did it in, came all the way from Preston down to watford London to fit it