Added a 7-segment display model (textures included in previous update)

Added a new knife switch model as well as a suite of 7-segment display materials

Added two new engine sounds: the Cummins QSK-15 and the MTU 12v183

Added new sounds for switches, breakers and plugs(!)

Added two new vertical gauge dials

Added a cool new gauge with a single dial texture (for now).

Added the MTU 8V4000 soundset (thanks Chessie)

Fixed the wire connector models, added a new material for EGPs

Naturally I didn't add something I was supposed to, so here's a separate needle model to go with the new gauge.

Added a bourdon tube pressure gauge as well as some other stuff I forgot about.