I second that on Nubcake. He'll get you setup with a generic file to start you with the 6spd then after you do some logs with ME7logger he'll revise...
Behind the lower center grille; originally attached to the plastic duct that feeds the oil/trans cooler if you still have it. Drivers side as nubcake...
Mine was much more accurate until about 3 months ago. I'm still looking for the sensor, wires, bracket...anything. I looked at lots of front end tear...