duals

I just picked up a 2005 silverado 4wd with a bad 4l80. I am doing to swap a 2007 Escalade l92 and 6l80 and mate up to the transfer case from the 4l80. I will be running all 3 ecms and am wondering how to piggy back the sensors to keep the factory gauges and functions. Also how do I keep the TUTD for the 6l80? If anyone has the pinouts for either vehicle, I would greatly appreciate any help as I am in the busy season at work and dont have a lot of time to research. Thanks in advance, Adam