Your odometer and speedo are not cable driven on a 97 as far as I know. Zetec and duratecs do have different final ratios. Which are swappable if that could help you any.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15