OTC Tools OTC 6550PRO Pro Master Fuel Injection Kit Perform fuel pressure testing, diagnose weak fuel pumps or restricted filters, test for fuel flow and perform leak-down tests. Kit includes: 0 100 PSI Fuel Pressure Gauge 47 OTC fuel injection system adapters each with a quick connect Schrader Valve 1997 2008 Fuel Injection Service Application Manual Replacement Seal Kit .