Wow, I love them. I like the classic look. That is why the CIs are currently on my consideration list, along with having my OE ones rebuilt to modern standards.
Carte blanche?
Hell yeah turn signals. My #1 mark against the CIs.
Idiot lights? Low fuel (1/8th tank?) would be cool. Maybe just lights for volt/oil/temp to use senders? I'd guess programmable would be asking too much (money). Programmable shift light and MPH light (like a speedminder) would be nice to have. They can be small LEDs.
That 140 looks ok. I'd fear 200 would be too condensed. I'd have to see.