Abstract: A function monitoring system particularly suitable for use in recreational vehicles, boats, and the like uses a multiplexing system with a display panel including a digital display for displaying time of day information. The display panel also has a legend display portion; and an alarm system continuously, cyclically monitors the condition of various functions to be monitored, such as, water supply reserve, holding tank capacity, battery reserve, etc. Whenever one of the conditions being monitored reaches a point where some type of action should be taken, the alarm system causes the legend for that particular function to be displayed adjacent the time of day display.