Nope, Ford changed the shape of the guage cluster/steering column trim in 1990 when they started putting airbag steering wheels on the cars. Therefore an '89 model speedo will not work in a post 1990 car. Someone correct me if I am wrong.
The speedos are the same and will work fine, you can send the speedo to "North Hollywood Speedometer" for re-calibration and repair. This is the only place I know of, they did my Saleen 200mph for me, and use to do all of the Saleen stuff.