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80-86 are the same style, then changed in 87 thru 91
Source: by justshootme84 (Randy Z, Casual Mudder) at BroncoZone.com
"-86 are the same style, then changed in 87 thru 91. I haven't found any vendor with a bolt-in or direct-fit custom insert for pre-97 Ford trucks. I think the curve of the 80-86 dash gauge bezel makes it so hard to modify that if you have something done it's worth hanging on to!!! JSM84 ..."
Cluster Swap from a 90 w/tach in an 89
Source: by Tim C (TnTbronco2, Trail Truck, Street Truck, Crazed, Broke, OoG) at
http://www.supermotors.net/clubs/superford/registry/1725/9435
Tim wote in page 1; "...Went to light truck parts and got a cluster from a 1990 bronco with a factory tach and trip meter. Looks alot worse than it was, only about 10 screws. page 2; Comparison of the two guage clusters, they had the same plug ins for the wiring..."
Cluster Parts Break-Out Diagram in 92-96 w/ Nomenclature
Source: by Ford via Steve83
http://www.supermotors.net/registry/media/760981
& Dash Parts Break-Out Diagram in 92-96 w/ Nomenclature
http://www.supermotors.net/registry/media/498379_1
vs
Parts Break-Out Diagram in an 87 w/out nomenclature
Source: by Dustin S (Dustball, Mellow Yellow, Mr. Laser Boy) at
http://ylobronc.users.superford.org/documents/dash.pdf