The wiring is shown in the 67 wiring Assembly Manual.
In general, the circuit breaker kit mounts on a bracket next to the fuse box. Power feeds to it. The switch mounts under the dash. The fog light feed connects between the CB and the switch then to the firewall. The firewall feed goes from the firewall to the lights. My 68 didn’t have ground wires, but I would assume they go from the lights to an appropriate ground.
68 289 convertible Candy-apple red & white
66 200 coupe Blue
94 GT convertible Red & black
98 GT convertible White & black
98 V6 convertible White & tan