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I have a combo inside/outside gauge. I velcro it just behind the heater control between the seats. I feed the wire for the outside temp sensor under the floor mats and into the hole behind the passenger kick panel (the one that houses the aux heater boost fan) and into the front trunk (frunk). I have the sensor at the front of the car just under the rubber seal that the frunk closed down on to keep it out of the sun. Works pretty good...