Pitot Pressure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2007 MINI Cooper, 2006 MINI Cooper, 2005 MINI Cooper, 2004 MINI Cooper, and 2003 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.
Engine speed and hydraulic pressure monitoring is accomplished through two Pitot Pressure Systems. Each system consists of a pitot chamber and a pitot pipe. The pipe is stationary while the chamber, which is filled with oil and rotating at the speed to be measured.