Will these mount at the factory fog light location without drilling?

Yes. These mount at factory rocker and fascia points—no modifications or drilling required. Test-fit before final fastening to confirm alignment with your specific unit.

Does the switch integrate into the existing dashboard, or does it mount separately?

This assembly includes a dedicated control switch. Mounting method and dash integration specifics aren't detailed—verify fitment with your vehicle's dash layout before committing to installation.

Do I need to run new wiring through the engine bay?

The harness is plug-and-play, so no splicing at the battery or relay box. You'll still need to route the harness to your power source—standard dash-to-engine bay run with existing grommets is typical for this application.