Wiring in a volts gauge.

Dang, you should have it. Does ANYTHING have power?

Headlights? Dome light?

I steered you a little wrong from the MAD article in my earlier post, but what you describe SHOULD work.

Two thoughts come to mind:

The ammeter terminals can and do fail in the molded terminals, but in your case, should only "negate" the parallel red wire

The factory welded splices CAN and DO fail. I'm privy to at least 6, 2 or 3 of which were right on this board. This splice is in the original black ammeter lead under the dash. You have to follow from the original ammeter ring terminal, untape as you go, and several inches to a foot into the harness, you'll find the splice.

Before you do that, I'd make sure you have power at the old ammeter wires. I'd disconnect them (with battery unhooked) then hook the battery back up and you should have power to BOTH with your hookup.

I assume the red on your alternator goes directly to the starter relay?