Stereo & Electronics - Wiring for the Light on Autometer gauge

I have a Autometer fuel gauge that I put in the vent on my car. I have everything hooked up except for the wire that goes to the Gauge light. I don't know which wire to use for this. I need a wire that has power only when the park or head lights are on. Give me some help please

You could wire it to your traction control or fogs

I don't have traction control. Which wire on the fog lights do I need to hook into.

thanks

on the dimmer switch i believe the green one, thats what i used for my tach