I dont know much about how to mechanically set this up but that's not the major issue. What i know for sure is that if you want to keep the dashboard in working order as to have all the gauges and warnings working you need to know exactly what to do with the electronics and that's not easy at all cos the D2's instruments are managed by the engine ECU which you'll have to let there and it needs compatible crank sensor and coolant temp sensor signals otherwise the rev counter and temp gauge will not work also due to a missing engine speed input the SLABS ECU and ACE(if fitted) will go to default as well... Beside that the air conditioning is managed by the original ECU too.
My friends call me Fery
2000 Discovery Td5 ES manual
Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope
if you think my english is peculiar it means you didnt hear my japanese
ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.