0 to 200 psi gauge, includes sending units, all air fittings and tubing to complete install. Choose LED color and tubing size, most DIRTY AIR systems use 5/32" airlines to the suspension. 2-1/16" diameter. Tinted gauge face so it blacks out when off. Newer style compact sending units for easy installation. Please note it is normal to pressure to fluctuate several psi on these gauges even while the bike is parked.