The TF GMC Clusters have left and right gauge mounting plates and left and right Bezel/trim plates. The lights mount/snap into the cylindrical towers sticking up in the back. As said, the towers have a big directional slot and the gauges have slits. There is a green "Gel" material all around the inside of gauge housings. The bulb shines into the gauge slits. They are all wired together and attached to proper headlight switch terminal. Except for the turn signal bulb and high beam bulb.
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