you need:
loom from unit to fusebox, either easy if 90spec, or hard if pre-90! Follow the plugs from it as far as you can.
hangers from inside the dash
speedo sensor, though a mk3 one will also work. may as well use his though as he'll need a normal speedo cable!
loom from speedo sensor to dash, but this might be a fair bit of work. not hard to make your own loom up using mk3 speedo sensor plug