OK so I'm new to diesels and just bought a 2002 f250 ccsb. It has a edge cts insight on it and has a little **** hanging from the steering wheel that does connect to the monitor. My question is that when I try to change tunes I don't have an option to do so on the monitor, and honestly not sure what this **** even does either. I've turned it but the monitor doesn't change power levels it just stays at I. How do I change tunes on this thing? What will I need to change tunes if need be?