Killer Custom, M8 air ride gauge kit. Black face gauge. 4mm5 32" (4mm). Mounts to the rocker box and adds a visual pressure check to your suspension system. Works with all air suspension systems. Allows quick and precise adjustments without guessing. Includes a white face 1. 5" 200psi air pressure gauge; one T fitting and one elbow pressure line fittings for a 4mm (5 32") pressure line and a steel gloss black powder coated rocker cover bracket.