Patrick,
When installing a modern sound system head unit in my BJ8P1, I replicated the vertical dash with the added space needed to save the original with original radio. This allowed me to save the original and, if and when I choose, return to original.
In this case, I would suggest you create replacement wood dash panels so you can arrange the gauges appropriately. You would then have the freedom to place all gauges with far less restriction (i.e. wiring, speedometer cable, etc). When you are satisfied with what you have created, you can apply walnut veneer and finish with multi coats of varnish or urethane. Using original chrome and consistently-finished gauges would give the new dash the image of originality.
Hope this helps,
Ray (64BJ8P1)