Mercury - MercMonitor NMEA 2000 Data Level 2 SmartTow RPM Kit SmartCraft Display 79-8M0135617. Overview. The Mercury MercMonitor NMEA 2000 Data Level 2 SmartTow RPM Kit (79-8M0135617) combines full SmartCraft functionality with SmartTow RPM control, giving you complete command over your boat's performance and towing profiles. SmartTow lets you launch and run using RPM-based profiles, making takeoffs smoother and repeatable for water sports and load-sensitive applications.. This Level 2 MercMonit