This listing is for a Faria SY9770A Marine Engine Synchronizer Gauge. This instrument is designed to help boaters synchronize twin engines, ensuring smooth operation and optimal performance. The gauge features a clear dial with 'PORT SLOW', 'SYNC', and 'STRBD SLOW' indicators. It is a genuine Faria part, known for quality and reliability in marine applications. Ideal for replacing a faulty gauge or as a spare part for your boat or yacht. Please refer to the images for specific details and condition. Installation instructions are partially visible, indicating a rotary switch for application matching (Gas Inboards, Outboards, Diesel Tach Gen).