sorry guys, i mixed some names. In Germany we use the word tach(o) for a speedo. I do have a std. cluster, with no tach. However, the technical authority here will not let my Cuda get street legal until i have this issue fixed (typically German behaviour). Since i have to adapt mph to kmh just with tape stripes for 30, 50 and 100 kmh, my idea is to get a 39 teeth speedo pinion and remove the existing with this. I have 3.55 gears and 245/60 15 rear tires.