Another Ammeter bypass question:

On my 64 I ran a new charge wire/fusable link from the alternator to the starter relay.

Then, pulled the original black charge wire from the alternator out of the bulkhead connector.
I put a fusable link on the original red wire from the starter relay, and plugged it into the bulkhead where the black was originally.

Disconnected ammeter, and in my case, spliced the black with the wire for the power seat that was on the red side of the ammeter.

Snipped both ends of the black alternator wire as close as possible to the original harness tape, and taped up the red ammeter wire just for the heck of it.