Retrofit passenger display to Gtc4Lusso

In the UK its a "compulsory option" on a Lusso.
Not in the sense of "Wow that's cool I must have it !"
More in the sense of "we won't sell you a car unless you have it, so please hand over thirteen grand".

I think i would like it more if you could take the speed off the display just leaving revs and gear.
How much info does one want want to share with one's significant other ?