I dont know of a cable. The Ford version of OBD-I is fairly limited. I own and drive several 2nd gen Ford Escorts, and the Check Engine Light and the stored codes have yet to help with repairs. I rebuild my own engines, I rebuild the automatic transmissions, and change the clutches in the 5-speeds myself. All without the 'help' of the EEC-IV system.
Luckily these cars arent that sophisticated anyway.