I have a light on both sides of my steering wheel however, one sensor for front, one for rear. visit www.k40.com. I also have it in my X5, but those sensors are in the insrument cluster. the k40 is controled by a concentric knob, which has a orange or green light next to it. if the previous owner took the k40, then this knob is gone, but there should be a dime sized hole in the dash somewhere unless the dealer covered it up. the k40 unit is about the size of a pack of cigarettes and sits way down low in the engine compartment. i can post pics if u email me.