Would be easier just to get a cluster with a tach. Aftermarket tachs work better with it getting signal from the coil (which will read wrong on the Zetec). Don't ask how I know.

Hector 2003 Rally Red Mitsubishi Evolution VIII 257HP/259TQ 2005 Lapis Blue Mazda 6s RET: 00 Cabernet Red Ford Contour Zetec ATX SUPERCHARGED 160HP/141TQ