OTC 7211 Gauge and Hose Assembly This gauge is designed to work with any of the fittings for testing fuel injection systems Features a sturdy 3-1/ 2 inch dial that reads 0-100 psi The assembly's disconnect fitting has a check valve to lessen chance of fuel spray Includes 6-feet bleed hose and 30 inch pressure hose. Bleed valve eliminates air from injection system and can be used to reduce pressure when disconnecting hoses Bleed valve also allows gauge assembly to be used to check fuel pump volume