I picked mine up at an "Explorer only" dismantler. I asked him "How do I know if it works?" He said, "We'll plug it into your rig and see." One screw & two plugs, and my old one was out and the new one was in. Did it in the parking lot. Just flipped the glove box out and worked through the opening. Everything worked fine, so I put the screw back in, closed the glove box, handed him 75 bucks, and went about my way.