72 swinger instrument swap????

hey guys i am swapping out dash in my 72 dart for a new set of autometer gauges and after market dash. Hear is my issue when i removed the OE dash i have no power to starter and engine to take out the old dash i had to disconect a red and black heavy wire the head light switch wiper and a small cluster type plug in dose any one know what i have to do to make this swap work and retain power to all. I want to have all my gauges in for start up getting close shooting for Saturday start up!! any thoughts on my new toy a 1966 barracuda i want to put a late model hemi in it and use as a driver and street sleeper