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BLUE - Night Dimming: connect to the head light switch. BLACK - connect to a main ground location Mounting: The gauge requires an oval hole 1-7/16” high x 3-1/16” wide. It should be inserted into the opening from the front and the 2 L-clamps will be installed from the back. Tighten a nut on each of the L-clamps so that the gauge is secure. Gauge depth to the back of the case is 1”. Gauge depth including the mounting studs is 1-7/8”. Operation: The gauge needs the red, orange, and black wires con