mmmm, i can not do this kind of job myself. For afraid of the damage of my car. Sensors need to drill and then can be installed. I bought a backup sensor, a full system: consists parking sensor(with 4), control box, and rear view mirror monitor, a back up camera(on license plate frame). Drove to a car care center, and had it installed, cost me US$300 to make it installed. Uh, expensive. Next time i would do a DIY to have a try, a little curious about the DIY installation of a parking sensor. That would save a lot.