Using a 74 Rally Dash Harness in a 1970

I have a very nice 74 Cuda Rally Dash cluster and harness that I am installing in a 70 Challenger. I looked at the wiring diagrams and noted some minor differences than the diagrams I had. For example, it says the clock lead should be black, but mine is red. Anyway, is there any big problem using it with the interlock wiring? I understand if you simply don't connect the seat sensors, everything will work ok.