An Arduino DIY Tachometer Display

The goal  of this project was to create some sort of display that would retrieve and display the rpm signal in an easy to read manor. I thought it would be nice to see this information while driving to see how the engine and the transmission react to different conditions. Though it maybe phased out by my custom touchscreen media center i'm working on now. That device would use a bluetooth OBDII reader that would give me much more than just rpm.