I'm with Cletis, and the factory style ones now come with the turn sig wires built in and in a variant for use with an alternator - even if you only save $20, a repro factory harness will have all the correct colors, and correct connectors, in the correct places, and be a much simplier 'drop in' improvement .... and they use the same quality material as any hot rod harness - makes it easy to use yer shop manual later for working on anything connected to the electrical system
Bill