I have a Safety Sync. I don't think they're made any more. It is a bear to set up but works great when adjusted. You only have to adjust it once. The feature I like best is if you lose an engine it pulls the other back to idle. You pull your throttle stick back to idle and then you can advance the good engine to an RPM you set. If you go past that position the engined goes back to idle. There is also a lead for a strobe light or gear switch. When an engine dies the light comes on or the gear goes down. I haven't tried that mode yet.