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This is a self-made digital gauge with datalogger function on the Android.
The data of the car is transmitted over the Wi-Fi.
The connection is lost now.
Signals of the car such as the speed pulses and the magnetic lap time receiver, etc. are processed with the H8 microcontroller.
And data is transmitted over the serial interface. But, HTC Desire doesn't have serial interface.
Then, I use Fon that is OpenWrt wireless LAN router. The data input to the Fon's serial port is transmitted over the Wi-Fi.
So, the Desire can receive the data via Wi-Fi.
This video shows how to work the digital gauge.
In this video, Desire is only replaying a logged data. However, actually it works same as shown.