Headlight power wire? - A/F & Boost Gauge Install
 

Hello,

I am installing a boost and A/F gauge and they both call for one wire to be connected to a headlamp power wire. Doing this allows the gauges to dim for "better night time viewing" when you turn on the light's.

I searched and read many thread's on the install for A/F gauges and Boost gauges but I don't see one that discusses the headlight power wire/ fuse. One says to connect it to fuse number 10 under the dash but that is the ETASC - ECU fuse and I don't want to tap into that.

What have you guys used? Do you run a wire into the engine bay?

Thank you,