The Cup use a mechanica speedo from the gearbox just like upto the 2001 July spec (I think thats the date) 172 use. The later 172 and 182 use the ABS system to get there speedo readings from.Andy_J said:you'll need to look at the speedo drive too, shouldn't be too much of a problem if your swapping the whole loom.. if not beware the cups gearboxes have mechanical drive and the non cups are magnetic pulses i think...