The speedo will not be off. If you have a tach, it should work. If you don't have a tach already, the tach in the SVT won't work, but if you check the Zetec forum, Drumnut posted and excellent how-to for a fix.
HTH
Ride: 2000 T-red SE
Beats: Kenwood 316S, Alpine MRF200, Orion XTR 6.2, Coustic 400SE
Mods: CTA, Magnaflow exhaust, SVT Instrument cluster, Knuaberized doors, side markers, F***ed up painted headlights.
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