QUICK SPECS Size:2-1/16" (52.4mm) Type:Mechanical Range:0-35 PSI Lighting:Incandescent Feature Points Traditional incandescent lighting illuminates around the perimeter of the dial AutoMeter s race proven mechanical instruments provide trusted accuracy while being simple to install No electrical system required for gauge operation - compatible with every street or race vehicle Mechanical movements provide accuracy and durability even in the harshest environments Gauge kit includes 1/8 nylon line, 1/8 NPT compression fittings, 1/4 NPT adapter, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation Ships With 1/8" NPT Male to 1/8" compression fitting, 1/8" NPT Female to 1/8" compression fitting, 1/8" NPT to 1/4" NPT bushing 2230