Hey, Does the gear convertor look like a factory job? Someone may have used an aftermarket convertor after changing their diff ratio or tyre diameter. I have seen diagrams for the MSD tach convertors that came with my Billet Dizzy and 6AL module (for a big block ) but it seemed to be mainly related to different american car ignition systems. There maybe one that works though.I'll have a look when I get home. Brakes are OK, but some fade occurs when it is driven hard BTW what did the W58 cost?