A high frequency sinusoidal wave is generated and applied directly to a gas discharge lamp in a power efficient electronic ballast. The sensor may further include an input probe connected to the sensor providing power and a ground probe connected to the sensor providing a grounded connection to the sensor. The lid molding includes at least one formation for each latch whereby an abutment will occur that will reduce the likelihood of prizing of a latch from the lid molding as a result of the latch moving upwardly about its pivot axis. As such, the device reduces vehicle damage due to inadequate ground clearance, while increasing vehicle stability and fuel economy. When the engine speed approaches the target engine speed, the gain is set to a smaller usual gain, and, in a change to the same advancing or retarding side, a change to an ignition timing in the same side is suppressed using a smaller advancing or retarding gain.