STILL AVAILABLE -- Glendinning Synchronizer- Automatically runs 2 engines as one with one control lever. Quieter, smoother, more efficient and very dependable. Compatible with all types of engines and controls. Definitely built to last. Includes the mechanical drive cables, plus extra control cables and connector fittings, if desired. Has operated flawlessly on 46 GB. Install and operating instructions incl.. $400.00, OBO, plus shipping from NW, (except local).