I found a Ford 6.0L diesel priced so low I couldn't pass, and, I knew beforehand it'd require certain upgrades to instill natural diesel longevity and I needed a tool to help - enter Scangauge II.Scangauge II has features beyond a simple scan tool, eg Trip Computer (Miles per Gallon; Tank-to-Empty; Cost per Trip), Horsepower, -Mile Time, 0-60mph WOTs, Stopping Distance and others...Neat features but not reason I purchased...Digital Gauges (reason): the Mfr refers to this feature as "X-Gauge"- Screen displays four real-time On-board diagnostics Parameter Identifications (OBDII PIDs) of user choosing- PIDs displayed can be changed via pressing adjacent buttons- Performance Data (MPG, Qtr Mile Time etc) may be displayed together/alongside PIDs- Displays vehicle mfr generic PIDs automatically (gasoline engine)- Displays diesel mfr PIDs (ie EOT, ICT, IPR etc) after user creates an 'x-gauge' by input data from Scangauge websiteWith basic knowledge and study I use this gadget to my advantage, I mean either repair vehicle myself, or, know what's wrong (exactly what's broken) beforehand, to preclude somename repair shop ripping me off - it's way too common.I think it comes ready to troubleshoot gasoline engines, in general, yet I'd to enter math data (avail on website) manually for it to sense and display PIDs unique to diesel.After several days of study/application, my opinion is this tool will help diagnose with near certainty, components which have failed and components in early stage of failure.  Its ability to depict four PIDs simultaneously in real-time allows comparison between what related PIDs reflect per desired and actual.Also note I found most big name Tuners boasting scan ability do not monitor/depict many key PIDs as Scangauge, a huge shortcoming for tuner price.Simply put, the Scangauge II is much more than an OBDII code reader and, it'll be difficult/near impossible to find an item offering same diagnostic capabilities for both gas and diesel engines at price.Update Jan 2014: I've purchased another for my Boy's pickup with a 7.3L.  We both have SCT Livewire 9600 Tuners but due to Livewire 9600's monitoring limitations we have Scangauges connected full time to monitor key PIDs.Kyle