http://www.mkiv.com/techarticles/vpc/vpc.htmT61supradean said:
Basically. cut the yellow wire going from teh VPC to ECU pin #66. Connect the VPC side of the yellow wire to the white (input) wire on the AFC. Connect the yellow (output) wire of the AFC to the ECU side of the VPC's yellow wire you just cut.
Regards,
Andi