yo,
Cable Replacement & Depiction at Speedometer Head in an 85; MIESK5 NOTE; Some Speedo ends (at Speedo) are held on by a plastic clip: place Index finger on Metal Tube & thumb on plastic ring flat surface; Press Flat Surface of clip & Pull Cable from Speedo (Ford calls the speedo end the Head); or screwed on: Turn the cable end counterclockwise to disconnect. You may need an open end wrench. This is by Chilton for an 85 Bronco; "...1.Remove the instrument cluster as previously described. Remove the lens and the mask from the cluster. 3.Disconnect the speedometer cable. 4.Remove the speedometer attaching screws and remove the unit. To install: 5.Position the speedometer to the pack plate and install the two attaching screws. 6.Examine the square drive hole for sufficient lubrication. If required, apply a 3/16 inch dab of lubricant (B5AZ-19581-A or equivalent) in the drive hole. 7.Reconnect the speedometer cable..."
Source: by Chilton
Gear Color Codes, 80 and up
Source: by JBG via Seabronc (Rosie, Fred W)
Gear Change in a 90 (in Xfer Case Tail Housing)
Source: by Keith L (TTB Blows, Bling-Bling)
http://www.supermotors.net/clubs/superford/registry/139/13464
Here are significant pics and info by Keith;
"The speedo gear is retained by a c-clip, visible just under my fingers here"
"Here it is with the speedo gear removed. Assembly is the reverse. You do NOT need to change the drive gear in the t-case"