This one has a lot of functionality and could be used with a rev bar to provide al ot more info to the driver.
Another LED/Arduino Rev Bar Project
This one includes a pretty detailed look at SimHub’s Arduino programming and config.
Arduino RGB Rev Lights for SimHub
Most basic project for this type of thing I’ve found . Provides a good foundation from which to move on to more complicated things.
Make Your Own Smartwatch From An Old Cell Phone – Tinkernut Labs
Make Your Own Smartwatch From An Old Cell Phone – Tinkernut Labs http://www.tinkernut.com/portfolio/make-smartwatch-old-cell-phone-part-1/
Open hardware guru answers: Arduino or Raspberry Pi? | Opensource.com
Open hardware guru answers: Arduino or Raspberry Pi? | Opensource.com http://opensource.com/life/15/5/should-i-get-arduino-or-raspberry-pi
5 favorite Raspberry Pi and Arduino projects | Opensource.com https://opensource.com/life/15/1/five-favorite-open-hardware-projects