Speed control and speedometer cables

The speedo on my 1972 Fury gran sedan has not worked since I bought her, so I’ve purchased a new one. However, reading the FSM and taking the ancient rusted one off the trans, I believe that the speed control unit is going to be integral to this matter.
It appears that there is no direct cable from Speedo pinion to the speedometer housing in the dash. According to the FSM one cable comes from trans to speed control servo, then another goes from servo to speedometer. Is the implication here...

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Author: Captainfury