It is my small project to add Gead display functionality to Suzuki SV650 K3+.

• Gear display (voltage from pink cable)
  
• Bluetooth logging and configuration by dedicated Android application (optional)
  
• Temerature and Humidity measurement and display by additional module (optional)
  
• Battery voltage measurement by additional module (optional)
  

• Main MPU - Arduino Nano v3
  
  
• Display - 128X64 OLED I2C 0.96"
  
  
• Bluetooth module - HC-05 (optional)
  
  
• DHT11/DHT22(not tested yet) module (optional)
  
  
• Standard Voltage DC 0-25V Sensor Module (optional)
  
  

(illustrative photo - only connections are important)

DHT-sensor lib: https://github.com/adafruit/DHT-sensor-library
EEPROMEx lib: https://github.com/thijse/Arduino-EEPROMEx
Timer lib: https://github.com/JChristensen/Timer
SvOLED lib: included in Resources/Libs directory

SV BT LOGGER - Android application to configure Arduino MPU without programming. Source code (MIT App Inventor) and bin file in Android App directory.
LCD graphic converter: http://www.hobbytronics.co.uk/downloads/bmp-lcd