Profile: J & S Electronic, Inc. is a manufacturer of ultra SafeGuard knock controller with individual cylinder timing control. Our products include UltraSafeguard, monitors, test equipment and new marine equipment. Our dual monitor with 2 way air fuel display is built with a light sensor which dims the display automatically at night, and increases brightness in direct sunlight. A ten segment bar graph display shows amount of retard, and thus gives an indication of the engine tendency to knock at any particular time. The monitor is connected to the J&S SafeGuard with a 3.5 mm stereo cable supplied in the kit. The new SafeGuard units have an on-board LED that glows in proportion to the amount of knock retard. The ten segment LED air fuel display now has a dual resolution feature with a switch that allows accurate tuning for both cruise and full power modes. The gauge is calibrated for use with a Bosch LSM-11 sensor, operating at 1450°F.