You installing the crappy ADD-ON kit from Ford? Or are you getting the complete setup out of a Salvage car?
I installed the factory Ambient lighting in my 2006 Mustang from a wrecked later model Mustang. That was rather simple since the Control Button was part of the Center console. So just had to install the correct center console and lighting under the dash a and that was that.
The 2014 Ambient is much more integrated and controlled through the cluster so don't think adding it on would be easy at all with lots of parts and reprogramming of the modules in the car.
I have seen the ADD-ON kit from Ford .. not impressive at all.
2012 Kona Blue GT ,Stone Cloth (originally Leather), Navigation w/ Camera, Glass Roof, HID and Security, Comfort Package, Brembo's , 6MT and 3.73 Gears
MODS: Boss 302 front end, CS fogs, JLT CAI, JL Audio Sub and Amp, Roush Springs, 2013 Cluster & Pony Puddles, 401A Dash