This is not a direct substitution for the Factory Service Manual (FSM) aka "The Toyota Bible", although it's a great supplement and covers quite a bit. Speaking of the FSM, I have included below a few links to different factory service manuals which will be useful for keeping your old Toyota alive.
1988 Toyota Truck & 4Runner FSM
1985 Toyota Truck & 4Runner FSM
1983 Toyota Truck FSM
22RE & 3VZE service manual supplement
1989 Toyota Electrical Wiring Diagrams
1987 Toyota Electrical Wiring Diagrams
Toyota Wire Harness Repair Manual
1984-1989 Toyota stereo install reference
John Muir’s How To Keep Your Toyota Alive!
(covers 1975-1987 / 2WD & 4WD Toyotas)!