picanbus_mon Raspberry Pi HDMI HS Can Data monitor/display PI reads realtime and OBD2 data from CANBUS and displays. Customized for a 2009 Cadillac CTS. The HDMI output of the pi is displayed on the OEM display via a navtool interface. Hardware needed Raspberry Pi Can interface (CAN232, MCP2515 based, or a Canable/USB) HDMI monitor Cheap Bluetooth media control Ebay Link Documentation and Install picanbus_mon wiki Link to video In Car Video