Autometer UL II Boost Gauge 2-1/16in Mechanical Pressure Ultra-Lite Gauge 35PSIMechanical boost gauges have become the staple in boost pressure monitoring for all types of engines, gasoline, diesel, or otherwise. Ultra precise bourdon tube meter movement ensures accuracy and durability not seen anywhere else in the industry. A simple 1 8" NPT pressure connection requires no electrical hookup for operation. Includes 1 8" NPT fittings and nylon line kit. Gauge kit includes 1 8" nylon line, 1 8" NPT compression fittings, 1 4" NPT