Here are some write-ups and information that I made while working on my 1986 F150 XL 5.0 (302) EFI.
Much of the info is useful for '80 to about '88 Ford trucks - F150-F350.
OBD I Self Test and How to Read Check Engine Codes
Dual Fuel Tank Selector Replacement and Fuel System Troubleshooting
Cruise Control and Horn Bar Diagram