The LCDT Selectronic Tattletale system is a compact fault annunciator with an electronic alarm/shutdown control system. It was designed to protect engine-driven or motor-driven compressors and pumps. The annunciator indicates the sensor, and hence the parameter, that causes an alarm or shutdown. In addition, a means is provided for testing the operation of each sensor without initiating an alarm or shutdown. Employing a liquid crystal display, the LCDT system gives a digital reading of the tripped sensor and the lockout timer countdown. As the heart of the system, the basic annunciator component has two variations: the Model LCDT-NO, which accommodates normally open sensors, and the Model LCDT-NC, which accommodates normally closed sensors. These units are enclosed in an aluminum box having a brush finish. The LCDT system accommodates 47 sensor inputs, 15 of which may be locked out during start-up by the start/run timer delay. A separate power supply is provided with the model LCDT instrument. Power may be supplied by CD ignition, a 120 VAC line, or by 12 or 24 VDC battery.