Take your time...
lay out the harness on a big flat area to get familiar with it.Personally i would make notes and tag groups of wires heading to each area of concern.
The wiring on an old truck like an 82 is pretty simple,Why are you replacing the stock wiring with a universal harness?
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews