Hi, Ive been away from tunning for a while. I have a 98 TA That I installed a 2001 5.3, and 4l80e in. Had the harness made to run the 4l80, and the 411ECM. Do I have to rewrite the whole ECM from a 2000 TA for it all to work? The harness was made by BP and plugs in like the stock one on the passenger side kick panel. Any info will be appreciated!