Hi Jim. I'm interested in your control unit, but I want to make sure it's what I need before having you mail it. I recently installed a b/u camera on my truck. I want to install a second backup camera on my work trailer. I have a schematic of how to wire it up to make eerything work like I want. I need 2 switchs to toggle between the truck and trailer. The a/c control that has switch for the heated mirrors and the heated rear window will work. I want to use that setup because i don't have to add any after marcket switches, and those switches would be lighted and would be right below the screen, making them very convenient. If your unit doesn't have both switches, it won't work