You don't technically need anything more than what you already have to make a CSP5 Tune and switch tunes. You will need to upgrade your tune flle to a CSP5 file using the V7.5 software and you are set. An Autocal or V2 can be used to switch tunes as well as the SoCal switch that you linked. The switch just makes it a little easier than the AutoCal or V2. The Cummins 6.7L CM2100A CSP5 User Guide installed on your computer as part of the V8 software install will explain how you upgrade the file to a CSP5 File.