The Harbor Freight Icon Master Fuel Injection Service Kit, No. 64938, is designed to quickly and accurately perform fuel pressure testing, diagnose weak fuel pumps or restricted filters, test for fuel flow and perform leak-down tests. The large impact-resistant dual-pressure gauge reads 0-145 psi and is accurate within +/- 1.6 percent. The fuel injection pump tester comes with high-pressure flex hoses, precision-machined brass fittings, and instructions for quick reference. The kit comes in a storage case that converts into tool-drawer storage trays.