I would think a guy could swap the two prong sensor with a 3 prong one. What I am gonna do when I convert my MJ to 4wd is just pull the electric sensor and swap it with the 88' speedo cable on my MJ. Looks pretty simple to swap, just remove a bolt I think. So since you have a TC from an older XJ, do you still have the one that originally came with your XJ or was it 2wd? Either way I think you could still swap the sensor out.
1993 XJ 4.0L 4x4 Sold
1988 MJ 4.0L 4x2 Sold