The Scangauge plugs into the OBD2 connector and gives you any DTC codes (and clears them), water temp, Intake Air Temp, Ignition Advance, Closed/Open Loop indicator, and a number of other things. You can get them on Ebay for around $150. It also gives you RPMs and since the Touring has no tach I thought that would be useful. Problem is it has about a two second refresh rate, so you see what your RPMs were two seconds ago.