In the instructions for a stand alone install on a 2018 Silverado it shows to cut the 12v and ground wires and connect them to the vehicle source if no RF kit is used. Is this necessary? I intend to use a fortin 2 way rf kit in the near future. Also there are not clear instructions on hooking up the valet switch. Where does this go? Also can i setup the rf kit function when i first flash the module and then hook up the rf kit later or will that prevent the 3x lock function from working on the factory remote? Thanks