Mike - you need the replacement speedo unit itself from the 94 + It just plugs right into the dash; however, a little care is needed when removing the dash cowl, lense, etc. I'd also clean all the back-light bulbs while you're in there & consider installing the white gauge faces as well. Shop around for the price (see the discount Ford parts dealers on the sccoa.links). Expect to pay around $120-140 and you'll need to place the existing mileage tag on your door jamb to be legal.
Jim