Unsure if anyone has actually managed to do it... Always seems to be tricky to run the wires & depending on the Nav unit etc, it may or may not involve a fair bit of chopping involved, so it may be wise to pick up a 2nd hand replacement cubby unit just incase.
If you can find one 2nd hand (Or pretty cheap), Blitz make a plug in unit that gives you a display much like the ECU Datascan &/or like what the R35 GTR has that goes into the factory Sat Nav unit.
Might not be the cheapest way to go, but it'll look pretty & everything will be built in, which seems to be what people want
