Been waiting almost 2 weeks for a tune that should have been in the tuner. I've updated the unit and called multiple times but have fun with that cuz you'll be in hold for 20 mins plus. Look for a different tuner that has better support.
This tuner is not as detailed as one you'd find st a speed shop but it allows you to deactivate active fuel management, adjust shift points and when the radiator fan comes on. I only used it on a gas truck, not sure what features it has for diesel applications. I'd definitely recommend if you can find for around $200. Tuner shop charges $175 to deactivate AFM alone.