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A few weeks ago my son switched from his old G25 wheel/shifter combo to a brand new Thrustmaster TX + F1 addon wheel. In the process he lost the G25 shifter that he used mainly for Nascar and MX5 racing. To get a working shifter, there were several choices: Buying a new shifter: obvious but expensive Use the G25 shifter connected to the wheel without using the wheel: inelegant! Buying a Leo Bodnar interface (http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=72&products_id=188): cheap and easy Build our own interface: even cheaper and more versatile We chose the latter option to have the best possible control on the gear shifting logic: the stock G25 shifting logic is somewhat buggy, leading to quite frequent mis-shifts. Having full control of the software also allows adding some new functions: a handbrake mode seems the most obvious as the G25 shifter has all the necessary hardware. In the following posts I will explain all the steps required to build a G25 shifter to USB interface, based on a Teensy 2.0 board. This writeup is split into 5 chapters, each chapter being one post: Chapter 1: Hardware and tools required Chapter 2: Wiring and canning Chapter 3: Software Chapter 4: Tests and configuration Chapter 5: Conclusion