Greetings - You should take a look at the Caterpillar Electronic Technician system - I use it in PA on some Cat G3520 engines, and it is awesome. It talks to all 5 electronic control modules on the engines, and allows direct viewing, logging and real time graphing of every parameter. It also logs and time stamps any out of spec event or fault. Very easy to use - if I could get it for my GIII, I would, and just keep a netbook in the car 100% of the time. Best regards, [email protected]