Something to thing about…
When wiring the switch, think aobut what you want the lights to do, other than light up the road.
Do you want them on all the time, maybe just with the headlights and do you want an option of turning them on without the headlights.
I have found that I use the Fogs with the Headlights and the Parking Lights.
I never have run them by themselves but they could be hooked up at DRL (Daytime Running Lights).
I like the idea of hooking up the Relay (pin 85) to the Parking Light wire, this would turn them on for all front lighting use, with parking lights and headlight.
You should consider a switch to turn them off of needed, just in case someone complains.
Good Luck and post some pictures and how you wired them up.