Everything was going so good

Mattax said
After that I'd probably be looking at the buzzer wiring.

A couple of us were helping with the '71 diagrams and parts a few months ago focusing on the headlight warning buzzer.
The diagram for the regular instrsument panel differs from the rally diagram.

May have to reference both and compare with your car to figure out what is correct.
https://www.forabodiesonly.com/mopar/threads/1971-duster.534041/post-1974226819