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ALSO...be careful because the GRAY wire is about to come out of the connector...which is your interior gauge light wiring circuit...and if it comes out and touches anything steel in the car that is GROUNDED...it will blow your instrument light fuse.
That looks like the connector for the factory radio that provides power, ground, and illumination. Pretty certain this is the connector that plugs into the left side of the radio near the gas pedal...