UPDATE: New board and new app with radio control and instrument cluster readout. Check it out at www.startercircuits.com.
This is my home brew interface from a Galaxy Tab to the BMW I-Bus which they used from the mid 90's to the mid 00's. I wrote an app that lets me send and receive data from an android device to the Sparkfun IOIO board. The IOIO board piggy backs on a custom board I designed and built that plugs directly into the stock radio's wiring harness. Apologies, learning Java left little time for learning cinematography...but I appear to be in good company.