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Description:  This tutorial will demonstrate how to build an LCD boost and AFR (air fuel ratio) gauge and displaying it on a 20x2 Hitachi LCD screen.  An Innovate LC-1 will feed the wideband 0-5v for 8-22afr readings.  The boost reading was setup to work with a Honda MAP sensor however any map sensor can be used with some change in the code.

The LCD will display Air fuel ratio with an indicator bar ranging from 8-22afr.  The LCD will also display current boost/vacuum and peak boost.  There will be 4 buttons to enable the menu, navigate and clear the peak boost.

Parts needed:

1. Arduino Uno
2. 4 Push buttons
3. 4 10k resistor
4. 1 10k potentiometer
5. 20x2 LCD (Hitachi compatible)
6. Misc wires
7. Usb cable for the Uno
8. Arduino IDE version 1.0.1 to 1.0.4 (tested)

Optional:

1. BMP085 Bosch pressure sensor (for sensing atmosphere if using absolute sensors)

Wire up the project on a breadboard or test board.

More details can be found here:  http://paulsvang.com/mylife/how-to-build-a-boost-and-air-fuel-ratio-lcd-gauge/