Pressure Gauges and Tachometer

    The pressure gauges (P_0 & P_1) measure the pressure upsteam and downstream of the pump respectively.  The pressure rise across the pump is calculated by simply substracting the values read on the inlet pressure gauge (P_0) from the value read on the outlet pressure gauge (P_1).  Note that the units of P_0 are in inches of water (in.H2O) and P_1 are in feet of water (FT.H2O).  The tachometer measures the motor speed in revolutions per minute (RPM).  The range is 0-2000 rpm with +/- 2% of full scale accuracy.