I'm rebuilding my 67 cuda vert automatic. I have a pretty good dash harness from a 68 cuda 4 speed car. Any glaring issues with using the 68 harness that anyone can think of? It has very little time on it.
I don't think there were many changes, you'd want to consult a diagram.. The 4 speed harness will have the back up lamps fed out through the bulkhead, to the 4 speed. If you are using a later auto with the 3 pin neutral safety, that would work out fine. Otherwise, your reverse lamp switch is on the shifter linkage, IE column or in the console.
You have a shop manual?
Download them here. Nothing in these, though about the special stuff for the 'Cuda Rally dash. I believe there's a 67 and 69, no 68, but the 68 -- 9 should be close to each other