Mercury - SmartCraft SC1000 System Monitor Round Black Face 85 mm 79-892219K19. Overview. The Mercury SmartCraft SC1000 System Monitor (79-892219K19) is the central display that keeps you connected to your engine's critical data in one easy-to-read gauge. Designed for front-mount installation, this round monitor fits a standard 85 mm (3-3/8") dash opening and comes complete with a black bezel. It displays essential engine information such as battery voltage, oil pressure, and water pressure, alo