Electronic monitoring, control, and circuit protection systems for use in aerospace, marine, transportation, heavy equipment, and residential applications, primarily comprising multiplex control systems for remote control of AC/DC power distribution, circuit protection and monitoring vessel functions, and data display of battery status, tank levels, circuit breaker settings, engine and generator status, AC power status, and alarms and electronics, data acquisition units and sensor interface units, solid state modules for use as remote switches, circuit breakers, timers, dimmers, and flashers, electronic control panels, annunciator panels, master caution advisory panels in the nature of visual and audible indicator for functions requiring attention, switch panels, electric actuators, electric valve actuators, analog and digital instrument panels, fuels systems consisting of fuel conditioning unit, fuel quantity indicator, fuel quantity system probe, fuel quantity system cable assembly, float switch; and component parts for the foregoing goods