95 5.7 to a 02 5.3 HELP

Hello to all,
I am doing an install of a 5.3 Vortec motor into a 95 Sierra with a 5.7. I completed all the of the mechanicl install and I seem to be hung up on a few pieces of wiring.
What I am looking to know is what wires will control the LED's behind the PRND321 indicators??? I have found Park, Reverse, and 2nd as they were located by the stock ECM under the passanger side dash but I cannot find the others.
Has anyone confronted this part of the install??? I have gotten all of my gauges to work properly, and this is all that is left so that I can start tuning.
Speaking of tuning.... I will make another thread for an idle issue I am having.
Thanks in advance for all of your help and I look forward to contibuting help here!