Hello. If you are just wanting 2 lights to work red and blue, just splice into the wires going to your tail light and join in the new bulb. I am assuming you have a bulb holder with the blue bulb. Just check you only splice into your tailight wire and not the brake Light. Make sure all wires are correctly joined and taped or heat shrink to stop any wires touching to cause a short. Use one of those screw driver lights to find your active wires if you do not already know. Ok hope that helps you out.
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Hello. If you are just wanting 2 lights to work red and blue, just splice into the wires going to your tail light and join in the new bulb. I am assuming you have a bulb holder with the blue bulb. Just check you only splice into your tailight wire and not the brake Light. Make sure all wires are correctly joined and taped or heat shrink to stop any wires touching to cause a short. Use one of those screw driver lights to find your active wires if you do not already know. Ok hope that helps you out.