Everyone, I was looking to upgrade my diagnotic reader. Purchased a Autel MK808 and learning to use it but thinking that I might want something that can read injector rates and rail pressures for my LMM. This unit does have all the modules that communicate with the BCM but it might be lacking some of the other things that would be worthwhile. I know many have tuner that can do the real time reading of many diesel items for troubleshooting but what are some of the suggestions for those that have a diagnostic reader that they recommend for the Duramax. Looking for something around the $500 range, the MK808 with discount was $425. Thanks, Dean