In order to tune the Mustang with a Predator Tuner, does a chip need to be installed in the engine or can the tuner just tune by itself?

 

You plug it into your OBD II port and start tuning. The instructions will show you where it's at, it's kind of hard to tell you without a picture, but it's located just behind your center console (front end of the car) in the area where your legs go. It's about 2 feet up above and about 1 foot back again from the pedals.