A device for sensing pressure using two flexible diaphragms in which an additional element is added to promote rolling contact of the diaphragm. The real time service components are to be utilized by local real time applications and the non-real time service components are to be utilized by local non-real time applications. The method includes providing a liquid inoculant of a bacteria grown to a substantially stationary phase. The drive direction is controlled by a lever to which a ratchet post is attached. After the engine starts, the valve position sensor directs the valve-driving member to rotate the valve member to the closed position. The failsafe valve includes a first open position in which the first and second chambers are fluidly connected to one another and bypass the pump.