I'm an idiot.
I thought they were saying this is the cruise control cable between the vacuum servo and the throttle... no, no, no. It's one of the speedometer cables, the one that goes between the speedo gear and the cruise control speed sensor.
Not the best part name... Or I don't have the best brain
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1984 F150: 300 L6, AOD, RWD. EEC IV / TFI, Feedback Carter YFA Carb. Stock everything but radio (for now).