OBD Scanner?

I am using a ScanGauge II in my 08 Tacoma and love it. It has trans and water temp a long with live time MPG. The best thing I added was a larger trans cooler, dropped temp 20+ degrees.

I was reading a post the other day about a scanner that will monitor the engine in real time. It plugs into the OBD2 port used for reading codes. The scanner that was being discussed monitored engine and transmission temps, RPMs, engine temps... I'm a newbie, but they were discussing a piece of equipment that will let you know, among many things, how the engine is doing as you trudge along up and down hills. Can someone help me with this piece of equipment? I thought it was called "something Gen 2" or something like that, but what are you using to monitor pressures and temps on the TV?