I just bought a Ralley cluster from a 72 Charger for $200. I dont yet have a wiring harness but my problem now is, I was told there are 3 different harnesses. 71, 72/73, and 74. I thought they all used the same cluster and that the only harness that was different was if you had a tach? Its going in a 74 Satellite. So do I need a 74 harness or will any 71-74 harness work???Please help Asap!