Hey Zach,
The minimum you will need for the Alpha 3000 pilot is the control system, a mechanical drive unit and the drive link. The drive link is the attachment between the drive unit and the rudder. It allows the drive unit to be completely disconnected from the steering when not in use. I'm not certain of the length of the drive unit on Betty Lou... I'll try to remember to check tomorrow when at the boat.
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Spectra_drive_unit.gif [ 8.21 KB | Viewed 366 times ] I also have the wired remote, which is awesome. It lets you steer using the pilot from the comfort of under the dodger, switching back and forth between autopilot and manual steering with the flick of a switch, and also set a new heading into the pilot.
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Spectra_Remote_Control.gif [ 13.84 KB | Viewed 0 times ] You will also need to fabricate an attachment point for the outboard end of the drive unit. Ours is high up on the starboard side just aft of the lazarette hatch.