AAU-9/A In rough shape probably well over priced for the condition, but in case anyone wants.
http://www.ebay.com/itm/Aircraft-Indicator-Rate-Climb-AAU-9-A-heavy-damaged-/130496943574
Be aware that it looks like someone has already opened it up and messed with it. On the picture of the back you'll see the electrical connector on the right hand side is missing. A good one would have two blue and two red wires and I only see one wire coming out. They may be intack on the inside but can't tell. Those are the wires for the lighting for the gauge, which you'd likely have to replace anyways, but if the wires are missing or damaged it would be very difficult.