●Fit for T10 194 lamp holder, used for car/motorcycle/scooter/truck. ●Apply for instrument lights, width control lights, reading lights, license plate lights, door lights, tail lights, etc. ●Twist lock instrument cluster, plug in and start. ●Please make sure the lamp holder matches your stock to ensure proper installation. ●Note: If the LED does not light up, simply rotate 180 degrees (reverse polarity).