apparatus and instruments for the testing of motor vehicles, namely, diagnostic units for testing, analyzing and electronically tuning internal combustion engines; warning, signaling and measuring units for use on or with motor vehicles, namely, instruments for measuring the efficiency of vehicle braking systems, units for measuring and adjusting the alignment of vehicle headlamps, vacuum and pressure gauges for measuring engine compression, stroboscopic timing lights, dynamometers for measuring the power and torque outputs of engines, temperature measuring instruments, namely, thermostats, thermometers and pyrometers, electronic thermostats, electronic thermometers and electronic pyrometers; tachometers; controls and regulators for use with vehicles, namely, remote engine controls and wheel drive regulators for testing brake efficiency; dwell meters for indicating ignition timing of internal combustion engines; electronic test instruments, namely, ammeters, voltmeters and ohmmeters; instruments for analyzing the exhaust gases of internal combustion engines; computers, computer peripherals and computer software all for use in connection with the testing of motor vehicles; and parts for all of the above mentioned goods