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Old 02-25-2013, 11:24 AM   #40
xwd
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Join Date: Feb 2012
Drives: 2013 DGM Subaru BRZ (Subie #9)
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Hey, as far as hooking up the illumination wire for my Greddy gauge, I used the Ill+ which is just a constant 12v switched on with the headlights. You can use the TAIL or PANEL fuses, they both go to 12v when the headlights are turned on. With that particular gauge, it doesn't use the 12v for powering the LED backlight, it just uses it to trigger the gauge to dim when it senses voltage on the line.

Getting something to dim with the dimmer (if that's your goal) is going to require some custom circuitry just like with the older Subaru models.
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