Well the fit is completely different for one. Two is that you've got a mechanical cable speedo vs electronic which I suppose would be easy enough to switch out with a 94-98 sending unit. You'd have to fab up a custom mounting system, make your own bezel, splice ALL your wires etc...
Not sure why in hell you'd pay the money to do all that for factory gauges that aren't all that accurate. Hell, the oil gauge isn't even a real gauge its just a 6 psi on/off switch.
Just get a set of white faces for your fox cluster and be done with it. OR if you want to spend the money you'll spend on making a SVT
cluster work, get a Florida
5.0 cluster with Autometer gauges.