I've got a harness from a 2003 5.3/4l60e that's been converted to stand alone. I'm trying to use it on a 2005 6.0/4l80e. I've been reading about converting a harness and it only mentions the round plug and a speed sensor. I've got a 12 pin connector at the shift lever that I believe is the park/neutral switch. How do I wire that in? Thanks in advance for any help

 

You are using a 2003 stock harness that has had all the trans wiring stripped out? What is the 80E installed in?