OK - I've searched high and low and haven't found the answer to what to me is a simple question!

The dash mount infotainment system in our 2020 31UL needs to go. Where it's located it is difficult to see and the controls are pretty much useless while driving. So I've found a 10" replacement that will fit in the spot, but I have a question about the hookup for the backup and turn signal cameras. Both the current Soundstream unit and the Jensen replacement have a single input for a camera. Am I correct in assuming that the switching device to select which camera is activated and displayed is already present somewhere in the coach? And is it simply a matter of removing the Soundstream and replacing it with the Jensen, and I'm good to go? (Assuming, of course, that I've hooked up all the wires correctly.)
Thanks in advance!
Mickey