As you might have seen in the What have you done to your Stagea thread, I recently bought a Nismo 280km/h cluster.
After I bought it, Iain informed me there are two versions, one to work with the factory screen/nav and one that doesn't.
The one that does is RNM50/8HH3, which is the one I have.
If you have freakishly small girly hands (*ahem*Iain*ahem*), you can do this with the steering wheel on. If you don't, you'll mangle it leaving the steering wheel on, and you'll have to do it again, like I do, as none of the screws will line up for the lower plastic cover and the plastic ring round the key barrel. It is damn near impossible to access the lower screws without removing the indicator and wiper stalks.
Andy has posted some instructions on removing the steering wheel already, which you'll find if you search. I might try and update this after I remove the whole thing and do it properly.
It looks the goods, and I'm stoked that my screen still works! Thanks to Iain for the help!