None of my factory gauges work 65 dart gt

I also have zero lights turn on when I turn the key on before the engine starts.
None of the lights should require a key.
You're going to have to look to see what the previous owner did.

For the ammeter look in the engine bay. Follow the alternator output wire and see where it goes. It should disappear into the harness and show up and the bulkhead. Same with the battery line except it should go to the starter relay, then to the bulkhead connector.
Take photos and post if this sounds overwhelming.

For the lighting connections, you can make some simple tests.
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The brake light, and dome light get power from the same fuse. Step on the brakes and the brake lightts should come on.
Open the door, or twist the headlight switch all the way and the dome light should come on.
Pull the headlight switch one click out, and the park and tail lights should turn on. All of those are on the same fuse. None should need a key.

Pull the headlight switch two clicks out and they should turn on. They get power from the main splice. Their circuit breaker is in the switch.

Brake warning lamp and IVR get power from the same wire coming off the ignition run terminal on the key switch.
If that wire is disconnected at either the key switch or behind the panel, that could be the issue.

Turn signals get power from the accessory terminal.
Since the wipers and heater fan work can eliminate that line being one at fault.