The speedo cable was connected to the trans, not the TC. There is a cap on the TC now where a speedo cable would be connected. I don't know if my speedo cable has enough length to reach the TC.
Then you have the wrong cable. Not that it wont work. High range 1 to 1 it will be fine as long as you have the right gear for your axle ratio. Low range is another story. For now get the bugs out and the odds and ends you can do later.
