New to diesels
 

I bought a 2004 GMC Sierra 2500HD 6.6L duramax with 140,000 miles on it. The truck has a Edge CTS Insight on it which is just the gauges and stuff not a programmer. I sent it back to Edge when I first bought the truck because the screen was not working. I drove the truck for 2 weeks without it. I just got it back and hooked it up and everything. The truck also had a knob next to the Edge that goes from 1-5 that I have adjusted before, when the Edge was not installed and it did nothing. The dealership also gave me a paper from the original owner saying that 5 was the highest power level. That's all it said. I do not know how to figure this out as I am new to this stuff. I want to get a few tunes on it and hook them up properly to the knob so I can change between them. But I don't know where to start. Anything helps. Thanks.

Your tunes were on your cts, when you sent it in they got cleared. In 01-05 you could load tunes onto a cts bit later years took too much data iirc.

So how do I get them back on?