Electronic apparatus and instruments for measuring, monitoring, controlling, recording and transmitting data relating to the operation of vehicles and engines or motors, namely, electronic control systems for engines for land vehicles, computerized vehicle engine analyzers; electronic vehicle monitors for monitoring vehicle journeys and driver performance including duration, speed, acceleration, deceleration, location, lane positioning, time in motion, automotive system parameters, engine logging and diagnostics, trouble codes; electronic vehicle engine control units, namely, electronic control systems for vehicle engines; vehicle power train control apparatus and instruments, namely, electronic control systems for vehicle power trains; electronic sensors for vehicles for measuring speed, acceleration, deceleration, distance, temperature and spatial orientation; diagnostic apparatus and instruments for use in vehicles for identifying engine failures for use in vehicles; On-vehicle diagnostic apparatus and instruments for identifying vehicle engine and system errors for use in vehicles; electronic data recorders and loggers for the purpose of monitoring vehicle journeys and driver performance; computer hardware and downloadable computer software for use in analysing the output of vehicle engine control units, namely, electronic control systems for vehicle engines; data processors for power train control apparatus and instruments