Auto Meter 4427 Ultra-Lite Electric Oil Pressure Gauge Traditional incandescent lighting illuminates around the perimeter of the dial 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system Gauge kit includes 1/8 NPT pressure sender, 1/4 NPT adapter, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation Auto Meters race proven air-core electric instruments provide quick and accurate readings while keeping hazardous fluids outside of the vehicle