None of my factory gauges work 65 dart gt

Borrowing this one from @dibbons 'cause it shows the bulkhead connector orientation vertical.
Alternator line connects at the top and the fusible link on the bottom.
upload_2022-4-6_18-13-31.png

Inside the car, the wire from the bottom of the bulkhead connector to the ammeter should be red.


In my opinion, the alarm and door locks should have been installed in the fusebox. There is often an empty slot for options (tach or a/c, or rear defogger).
Sometimes accessoris that weren't used when the car was running would be tied into the red post on the ammeter. Convertible tops and clocks for example.

You'll have to figure out what was done in this case by the installer.