Has anyone tried one of the G-Tech or other displays?
 

Seems like this might be cool to try on the HHR SS:
http://www.gtechpro.com/ss.html

http://www.gtechpro.com/

Also, these look pretty cool:
http://www.auterraweb.com/

Anyone have experience with these or know of any better ones?

Well I bought the Aeroforce Gauge may want to look @ my post on them....They do alot and can give you the items your wishing for and more...
https://www.chevyhhr.net/forums/hhr-ss-45/did-my-aeroforce-gauge-now-18553/