Auto Meter 5411 Pro-Comp Liquid-Filled Mechanical Fuel Pressure Gauge Traditional incandescent lighting illuminates around the perimeter of the dial Liquid dampened movement provides smooth pointer movement and extended service life in harsh environment applications. Liquid filled design for superior resistance to shock, vibration, and the elements. Gauge kit includes, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation Gauge threaded for -4AN, allowing an easy installation into the fuel system