FARIA Synchronizer Gauge. 4" - White/Black Rim Model : 32907 Manufacturer : Faria Electronic synchronizers work by comparing the pulse frequencies generated by the ignition systems, alternators, tachometer signal generators of dual engine installations. The synchronizer is hooked up to +12V DC, Ground, and to each tachometer's signal source.
New in box. Old stock. Plastic clamshell slightly deformed.