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Once the sending unit wires were run and out of the way, we collected all six ground wires and mounted them to the brake pedal housing. Next were the red power wires, which needed a switched power source, such as from the ignition or fuse panel as seen here. The green wire, above the power leads, sends the necessary juice to the voltmeter. This wire does not need switched power, so we hooked it into an accessory power prong in the fuse box. For the dimmer leads, we tapped into the headlight switch as this option needs power when the lights are turned on. This will dim the readouts for comfortable nighttime driving.