Todbot makes an interesting suggestionAnalog meters are hard to use in hardened environments. If you're showing data from digital sources, why not use a digitally-controlled analog meter?
laser cut acrylic meter face & needle, tiny 25mmx12mm $3 servo, and arduino. - Servos as meters on Flickr
MotorShield for Arduino Kit
http://blog.makezine.com/archive/2008/08/servo_meter_anyone.html