Excellent product. I read a review of someone saying the directions were poor, couldn't disagree more. If you can read and have basic skills you can install. I meant to order plug and play but purchased the other (my mistake not theirs) i decided to give these a try instead of using my OBDII port, it took a little while to find the correct door ajar' wires but only because there are what seems like MILLIONS of wires on a f250 crammed into the space. The instructions were detailed, the AMP wires are color coded the same and if you take your time you will find the right ones. One hint, they are basically running together or near each other and not spread out amongst all the others. If you think about how the wire harness is made and installed at the factory it would only make sense for them to be grouped together. I tapped the 4 wires with the supplied taps and PRESTO it works like a charm. They drop down instantly, way faster then you can climb in. The looks you get when folks hear and see them drop down is priceless and worth the 4 hours of install.