I called Dometic and talked with them and he said I would need Kit #3313189.000 for my set up. So I ordered it but it looks a lot more complicated than others have posted. First, I do not have 12+ wires at my roof top a/c unit. All I have are the 120V, the plug from a/c (6 wires,) and the freeze sensor and the ribbon from the thermostat. There aren't any wires from the furnace or elsewhere. The kit wants 12+ to hook up to it but I don't have that. I don't have the 2 furnace wires either that are needed to hook up. The back of my thermostat had the ribbon connector and another connector with 4 wires from it. I have no idea where the 4 wires go. The ribbon came out by the old analog box in the a/c. I really don't want to have to disassemble half the interior to route new wiring. Thoughts anyone?