One result of the continuing pressure for ever more fuel-efficient vehicles is a greater use of direct electronic fuel injection (EFI) systems. These injector/valve controller systems help ensure the most efficient air-fuel mix within both diesel and gasoline engines regardless of the running conditions of the vehicle. By connecting the fuel injectors to the engine control unit and various sensors, including exhaust gas temperature (EGT), ensure the appropriate and precise spraying of the atomized fuel.