1971 Demon Rallye Dash schematic

Dana67Dart said
Any of these will work green circles

View attachment 1716196242

View attachment 1716196243

If the cluster is out it must be grounded to function on a power supply.

If the cluster is in the car the lower ( I believe) mounting screws provide the ground. But don't quote me on that.

It is that way in 67.

It's a good idea to run an auxiliary ground wire from one of the screws to a chassis ground. Putting a bayonet connector on the wire helps if you need to pull the cluster out.