I can't answer your question but I agree with Car Nut. I know the harnesses at Year One look expensive. I've done a fair amount of car wiring and while restoring might be an option, "correct" restoration would be expensive also. Having all the different correct color & gauge wires and connectors readily available would be tough unless you go to a pro and that means $$$'s. If you harness is out of the car, getting everything the correct length in the correct position would be near impossible without a jig for your specific car/model/accessories.
That's just my opinion, maybe someone here on Moparts knows of a company that can do a correct, quality job for less.
FYI - If your talking about a dash harness, this would be a good time to bypass that ammeter.