Partsam T5 74 Wedge COB Blue Instrument Panel LED Light Gauge Cluster Indicator Lamp Bulbs with PC74 37 Twist Lock Base Socket, Pack of 10 LED TYPE: COB LED Bulbs W2.1x4.9d - 9mm Subminiature Wedge T5 Hole 17 18 37 70 73 74 79 85 86 2723 Applications:Gauge Cluster Indicator,Speedometer,Odometer,Tachometer Light If the LED does not light up, simply Rotating it 180 degrees (reverse the polarity)