I knew they used cable and the signal generator, but I didn't know what gear was on the tail shaft. You can use any speedo, you just have to figure out the correct gears to get it accurate. There are places that even make gear boxes to reduce or whatever it takes to make it workout. One of my first jobs was as a mechanic at a cab company, and back then they used cable drives to meter the ride. We had to fool around with them and the state regulated and inspected them... It was like working on a watch...you would also have to make up a cable... Those ratchet shifters are ok, but not all they are cracked up to be, imo... Pretty common craigslist or flea market find. It wouldn't be that difficult to make a simple automatic trans shifter to mount in the dash, as long as you don't want to manually shift, or the like. That would make your T stand out! You could also try to convert a camaro style console shifter to work, they are cable activated.