I use this thing called Techstream. It's actually a laptop (Toughbook) and has a special adapter that connects to the bottom creating and interface between the OBD2 and the laptop. It lets you graph anything the ECU reads and can even download ECU updates to the ECU or anything else that has a computer. It will even interface with Toyota Information System, and is sponsored by Toyota, costs about 8,000 dollars and sits at Burt Toyota until I need to use it :tongue: Neener, neener!
But those sound cool too.