Depending upon what the doctor says tomorrow when I see him, and when my new wife recovers from her hip surgery scheduled for Thursday, the mid-April date may change.
Usually, the selection of which wire harness to use depends entirely upon the dash cluster one has. I always advise folks who want to upgrade to the tach dash cluster to first procure it, as it will be the most expensive piece for sure!
The only other thing to worry about on a 67 is if it is a very early model, which has 4 separate leads for the foot washer vice later models which has a 4 pin connector.