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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8166158" data-attributes="member: 576029"><p>most aftermarket head units have an orange and and orange/white for dimming or illumintion.  you need to figure out what your car does first.  with a DMM, measure VDC on the factory wire as you vary brightness.  use the illumination wire if the wire goes to +12VDC when the gauge lights are on, and that voltage doesn't change.  use the dimmer wire if the voltage varies.</p></blockquote><p></p>

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