What is the definition of of link & sync and how do I do it to my Johnson 70hp? My rpm's are not picking up until my shifter is almost all the way forward until I can't go any more. I changed my cables, have great compression, carbs clean. I just don't know how to adjust my control box to my engine. It shifts great, but my throttle just ain't right! Would I need to link & sync in this instance. If not, what do I do?