Do a search, theres tons of discussions on this topic, with the general conclution that:
A) the analog dash is much better. The digital dash is missing a bunch of stuff.
B) It's a major pain in the ass and no one should try it.
I personally think the digital dash is really cool, and would rather modify it to include all the things that the analog one does (actual oil gauge vs. idiot light), and it seems like that would be easier, the way everybody is talking.