Quoted from sc204:And one other thing, no need to label board connectors. No need to write on the side of the connectors the corresponding board connection. Just looks ugly
The harness will fall pretty much back in place. Due to the configuration of the pins and blanks in the connectors it is hard to connect to a wrong spot on the board. And if you have 2 choices or are not sure which board a connector goes to just look in the manual (available on line if you don't have it) and it will tell which connectors with which color wires go where.
Or you can just use these, which I got from somebody's advice on Pinside. They are invaluable to me during restorations. Label everything on the teardown (along with pictures and written documentation) and it makes the reassembly a cakewalk. Just clip 'em off when everything's together and working well.