Haltech Flex Fuel Composition Sensor for 3/8 (GM Spring Lock) Fittings w/Plug & Pins – High-performance automotive part designed for precision, reliability, and optimal compatibility. Ideal for tuning, upgrades, and motorsport applications. Supports advanced engine management strategies. Keywords: haltech, flex, fuel, composition, sensor, for, 3/8, (gm, spring, lock), fittings, w/plug, &, pins.