This plug-n-play T-harness works on the 2013-2019 RAM trucks with 5 in. or 8.4 in. factory displays. The harness has a wired-in toggle switch that allows the driver to switch between the views of dual rear-facing cameras that could include a tailgate backup camera, aftermarket cargo camera, or trailer camera. To work properly, your factory display must currently change to rear camera when vehicle is put into reverse, otherwise, the vehicle must be flashed by a dealer or backup camera interface must be installed (Part #9002-2783).