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Message: <blockquote data-quote="lwarrior1016" data-source="post: 1498205" data-attributes="member: 20210">I can’t remember the exact routing for that trans harness but I believe it runs up and connects at the passenger side firewall just like the engine harness does. From there it’ll go in to the car. The good thing about these is the stock ecu does not control the speedometer. So if you find the wires going to the gauge cluster for the speed sensor (I’m sure someone here has a wiring diagram that can help), you can connect it to the speed sensor on your trans and get the gauge to work. Making the gauge accurate will be a different story though. Depending on what the t5 came from, what gears you have, and what your rear tire size is, you might have to get a converter box that’s programmable from someone like Dakota digital.</blockquote>