What do I need for 7 segement displays

Hi.
I've just taken delivery of a PhidgetSensor encoder to test on my cockpit and I am very pleased with the results. I will buy more! :)

If I wanted to use phidgets for the 7 segment displays (IAS, Heading etc) on the FCU of my Project Magenta Airbus what would I need?

Would writing the software be too difficult?
Would I need common anode ar common cathode 7 segment displays?
Can it be done!!! :o

Many thanks,

Darren Sugden
www.sugden.karoo.net (A320 Cockpit Project)