I'm really digging that guage cluster job but I won't lie, I probably only like it because it's like that in the M3. If I was not biased, I'd probably continue to prefer the traditional amber only instrument cluster. In any case, that's way too much DIY for me to want to tackle. I'd be remorseful if I messed anything up.
I don't have any use for that 12v also! I use the one in my arm rest to charge my phone but that's all. I guess a friend could use it as a secondary phone charger if I ever road trip.