The ECM Harness goes from the ECM/ECU to the engine harness. It also has the intercooler relay and other sensors. The PATS can't be turned off with your handheld. At least my SCT won't. A professional tuner should be able to.
Fuel is easy. but you'll also need an FPDM (fuel pump driver module). It tells the pumps when to come on and when to shut off. It's a returnless system. You'll also need the FPDM harness for this too which is located in the rear body harness. I just gutted it out of the body harness and it works fine. (took a box cutter and a lot of time) It is located in an 03 cobra in the drivers side trunk liner. You can install it there in the same place. Your PATS system is located there as well.
Fuel is easy. but you'll also need an FPDM (fuel pump driver module). It tells the pumps when to come on and when to shut off. It's a returnless system. You'll also need the FPDM harness for this too which is located in the rear body harness. I just gutted it out of the body harness and it works fine. (took a box cutter and a lot of time) It is located in an 03 cobra in the drivers side trunk liner. You can install it there in the same place. Your PATS system is located there as well.