Make sure Revain sent you the correct sensor box - DOUBLE CHECK. Be sure to scan each sensor before installation if you can. I can't stress this enough to help someone save money. They came the next day, Prime took them to the tire shop to break the beads on the original wheels, I watched him put these on. For an additional fee, I had the wheels balanced on the street. They ended up not scanning or reading with the few professional programmers they had at both of their tire shops. I didn't have $100 ($25 per tire) to balance the road forces.