Todbot makes an interesting suggestion

Analog 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


Makershedsmall

Mkad7-2
MotorShield for Arduino Kit