Features and Benefits: Ideal for testing vacuum lines and components; Accurately tests low-pressure fuel systems; Quickly diagnose internal engine problems such as bad rings, valves and leaking head gaskets; Kit comes complete with adapter for most applications; Pin point hard to find problems such as cracked lines, PCV fuel pump fuel filters and more; Large 3-1/2" gauge features a chrome bezel and rugged protective outer boot.; Dual purpose gauge reads vacuum and pressure.; Dual scale gauge reads 0-30 in. Hg vac and 0-70 cm Hg, also reads 0-15 psi and 0-100 kPa.;