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Before You Begin The installation kit contains a registration card, installation guide, 3900 device, antenna, 20-pin harness, ring terminal, self-tapping ground screw, star washer, eight 8″ (20 cm) and six 14″ (35.5 cm) zip ties. Additional tools and supplies that you may need include a digital multimeter, crimping tool, razor knife, wire strippers, electrical tape,…