Why not start out with...
OIL Pressure... but you don't want that, so get electric
Water Temp... interesting but useless if you don't have anything exciting installed
Voltmeter... I guess you don't have a sound system installed since this is a dumb idea to you
Amplifier Ammeter... do you have a kickn sound system?
Amplifier Temperature... do you have a mega kickn sound system?
Fuel Pressure... do you have any forced induction installed?
Boost/Vac... same question as above
Nitrous Pressure... do you have a nitrous system installed?
Pyrometer... same question as above
I guess you could always get a TACH or a SPEEDO, but that would be kind of pointless to install on your pillar unless it was digital
how about just adding a simple Shift Light to your setup and bypassing the whole pillar idea all together?
I hope you can read past my sarcasm and use some of the suggestions I've posted to get you moving in the correct direction of how you're building your car... It's better to buy something you actually need (will need), than to buy something that is useless to your goals - good luck with your final decision