very easyits 30 mins. job, its a plug and play and it depend where you get it from. What I mean is if you are getting it from PP( www.performanceproducts.com )the extra wiring harness is included (as well known as pig tail) if you are getting it from ebay or some where else the pig tail might not included. Good luck on your mod. IMO that is the best mod I ever did to my ML
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!