Control cable Length on 23 CC

[thedink9]

Can anyone tell me how the control cable lengths are derived? Overall length (end to end) or are they measured from the knob at the binicle side to the adjustment knob on the engine side?
I think I need 20 ft. cables as that is what an old one measures between the knobs.
What size cables are you 23' CC guys using? I guess this is another way to doublecheck.

Thanks Dink