69 barracuda wiring questions

Black barrel connectors are for hood mount turn signals wire connections AO1 light package option.

Tan wire w female spade at firewall is for oil pressure sending unit.

The reverse light switch plug should go to a short mating plug that's wired in with the firewall plug for the windshield wipers. That short mating plug setup was after feb 1969 I believe. I think before feb 1969 the spades pinned directly into the firewall plug that has the wiper wiring.

Hope this helps
Matt