Hi and thank you for your help. My GT has OEM Fog lights. I am installing 4" round Halo, Projector lights on my newly installed GT500 Bumper lower Grill. Thank you@DougS550
Not sure if this is what you are seeking, but the thread lists the correct dash illumination switch and DIY steps if you’re wanting to add fog lights to a non-equipped S550:
https://www.mustang6g.com/forums/th...ost-pp-fog-light-install.138101/#post-3109203