The 92 wiring will not “match up” because the 90-93 trucks use the “big white plug” on the firewall for the wiring connections. The 88 uses several small connectors
the 92 also uses a different power distribution box and some under hood wiring changes between 88 and 92 for the headlights, ignitions, charging system etc
Many who have gone before you have simply swapped everything over to the 88 even the steering column and dash adding the big white plug to the 88
I have done this a time or two
My 88 still has a 88 dash and most 88 firewall wiring, yet I installed a 93 4.0 v6 under hood wiring and now a 97 5.0 drivetrain. The wiring is do able and the information is available
Many ways to get the same result just depends on your goals and abilities as well as budget