I have been working on it for a while now. I want to get rid of the spedo cable witch means changing over to a electronic spedo. Witch means adding a VSS. I am looking at using a mk3 VSS (it is a gear driven VSS. Would have to do custom work to get it in our fox Trans. Or get a VSS and sender off of a Audi that used the same size diff. The sending unit is a ring that goes on the diff replacing the speedo drive gear.