td5 auto into tdi defender

I have been looking around a bit on the net about doing this conversion and the general consensus seems to be you need a hydraulically controlled auto or a compushift. I would rather have the whole lot from a Disco 2 and transfer it over to the Defender including the gearbox ecu and loom which I assume would still communicate with the engine ecu and if there are any additional pickups required surely they could be wired in.

Depends if you keep the engine 300 may be better with D1 box