mark ,first u hook the lead to the plug wire.. then assuming u have the rite tach so u can use it while cutting.. see what the saw wants to rev to after its warmed up..then put it in the wood u plan to be cutting most and watch the tach..adjust by tiny turns and see what makes it stronger in heavy cut.. not just faster no ld reving..i like as much fuel on the low end ,but make sure u saw still cranks when cold,and is still responding fast to throttle..
this aint much , and u can develope u own ways o doing it..
the setting by ear will do about as good ,once u learn what to listen for..oh i forgot.. u already been setting by ear.. good luck..
