It tells you the part number for the external voltage regulator, and how to wire it up. Expect to pay $15 for this regulator at AutoZone.
Update: The Borg Warner Select Series one is $30 from O'Reilly's (I'm a professional mechanic that doesn't touch any of the crap AutoZone sells). 18 AWG (pink) Female Bullet Crimp on Terminals fit the regulator perfect.
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician