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How to install a JVC KW-NT3HDT Multimedia Navigation Receiver?

I am installing a JVC kw-nt3hdt and I need to know what color the speedometer signal lead is please help

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"Adaptive Volume: When this function is activate, the KW-NT3HDT automatically increase the volume level (both for Navigation and audio/video) as the car speeds up. You can set this feature to Min, Mid, Max, or Off.

Note: You must connect the unit's Speed Signal wire (pink/gray) to your vehicle's speed sensor wire." good luck

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