Air flow sensors; throttle position sensors; manifold vacuum sensors; manifold temperature sensors; crankshaft position sensors; camshaft position sensors; knocking sensors for engines; fuel-oxygen ratio sensors for land vehicle engines; pressure sensors for fuel tanks; acceleration sensors; speed sensors for automatic transmission; oil temperature sensors; inhibitor switch for automatic transmission; water level sensors; hydrogen gas sensors for land vehicle engines; electronic controlling devices for land vehicle engines, batteries and power trains; power controllers; cruise controls for motor vehicles; automatic liquid-level control machines and instruments; automatic liquid-flow control machines and instruments; electrical controllers; electrical controlling devices; electrical controls for hybrid vehicle batteries; electrical control cables; voltage measuring device for cell stack; apparatus for intercepting electric power for land vehicle engines; integrated electronic controllers for engines and transmissions in land vehicles; solenoid valves; electronic controlling throttle valves for controlling gas or fluids; solenoid valves for automatic transmission; electronic controllers for engine fuel injectors; electronic controllers for land vehicle transmissions; electronic vaporizer; electronic position sensors; electronic speed sensors; electronic air flow sensors; electronic knock controller for engines; electronic idle speed controller for engines; resistance measuring devices; brake controllers; electronic exhaust gas controllers for engines; pressure measuring sensor for vehicles; fuel tank pressure sensor for vehicles; position sensors of throttle valves for vehicles; oxygen sensor for vehicles; acceleration sensor for vehicles; knock sensor for vehicles; crank position sensor for vehicles; camshaft sensor for vehicles; current sensor for vehicles; steering angle sensors; tire pressure sensor; conductive sensor of fuel cells