Rallye cluster gauge issues - 67 Barracuda

You should ditch the Ammeter and convert it to volts while in there. I did that with mine. Requires a sun volt gage, 1 small jumper wire, and you tie your 2 ammeter wires together and stick em back in the harness.
Sounds like a great idea. When I realized they routed all power to the car through the ammeter, well I'm still shaking my head. Does the sun volt gauge you mentioned replace the existing amp gauge in the cluster, or is it mounted remotely? Do you have a link or a part number? Thanks again. I really appreciate the wealth of knowledge in this group.