16001721 Sirius Control Unit allows the user to control which parameters are displayed on the Sirius Vision * A GReddy Sirius Control Unit is required for Sirius Meter, Vision & Unify sets. Compact control unit to access all the functions necessary to operate the sirius series meters Multiple meters can be controlled using one single Control Unit - Links up to 3 Sirius Visions and 8 Sirius Meters (total 11) Self-diagnosis function to quickly assess any connectivity issues Includes the main connector, communication harness and power supply harness https://youtu.be/SfQboKv22tA For use with GReddy Vision display (sold separately) GReddy Sirius (Analog) Meters: (sold separately) Turbo Boost / Fuel Press / Oil Press / Oil Temp / Water Temp and GReddy Sirius Unify sets: (sold separately) 1x Sirius Vision + 1x Sirius (Analog) Meter: Turbo Boost / Fuel Press / Oil Press / Oil Temp / Water Temp Optional Sensor sets: (sold separately) [ Boost / Pressure / Temperature ]