Air/fuel ratio gauges; antifreeze testers; automotive measuring instruments, namely, water temperature gauges, air fuel/ratio gauges, boost gauges, vacuum gauges and exhaust gas temperature gauges; brake controllers; brake fluid testers; diagnostic apparatus for identifying refrigerant type and purity in automobile air conditioning systems; electronic apparatus for testing automobile engine oil; fuel gauges; fuel pump testers; gasoline gauges; leak detectors for vacuum pumps; pressure gauges;...