PRECISION READING - Accurately measure up to 220 PSI (15 BAR) of air pressure from 4 sources such as airbags in a air suspension system or the air tank in a train horn system 2" ILLUMINATED FACES - Face of the gauges illuminates with an amber back light for easy readings in dark environments, the bulbs are replaceable if needed QUAD AIR INPUT - Featuring four 1/8" NPT Male connectors attached to 1/8" NPT Female compression fittings compatible with ¼" OD airlines to connect the air gauges with four diferent air sources METAL DASH PANEL WITH 4 SWITCHES - Gauges comes installed in a metal dash panel with four 3-Position momentary rocker switches that allow you to control the inflation/deflation of the airbags PREMIUM QUALITY & BEST VALUE FOR MONEY - This dual air gauge dash panel was designed to ensure it lasts many years with daily use. A 1-year warranty is provided for all its parts. We strived to keep it affordable compared to the exceptional quality These dual needle black face air gauges with amber back light are ideal for any suspension system with a maximum pressure of 200 PSI. Will measure four sources of air pressure on two scales of 0 to 220 PSI and 0 to 14 BAR. Each gauge has two 1/8" NPT male fittings on the back and includes four 1/8" NPT female compression fittings for ¼" OD airline. Comes with Four 3-Position momentary rocker switches and a black powder painted metal dash panel. Two 2" Dual Needle Air Pressure Gauges with Four Switches and Metal Dash Panel Air pressure Dial: 0-220 PSI Gauges Color: Black with Chrome Bezel Back Light (Amber) PSI/BAR Dial Scale Maximum Precision Two 1/8" NPT Male Connectors (each gauge) Four 1/8" NPT Female Compression Fittings for ¼" OD Airline Included Metal Black Powder Painted Dash Panel Four 3-Position Momentary Rocker Switches Measure four different air bag pressures For suspension system up to 200 PSI Dimensions: 7-¼" W x 2-¾" H x 3-3/8" D