The PBH plugs into the bottom of the ECU and then you connect the CANBUS leads. The only other connections from the harness go to the clutch pedal (very easy), the ignition (you remove 1 wire and insert the PBH wire) and then you run a wire from the PBH harness to the fuel pump.
Once I deciphered PBH minimal instructions I was surprised how easy it was. So all you need for a conversion is:
1. PBH harness
2. ECU and engine harness with the pedal for that year
3. Tranny harness
This will fully function in any 05-09 and run the rear lights, ABS, full CANBUS, Dash and what not. I'm even running the 08 GT500 dash in my GT and it was literally plug and play. (installed before the swap)
JUST HAVE TO SAY THANKS TO JUICE FOR ALL THE HELP !!!