The Ford Manifold Absolute Pressure sensor found on all speed density equipped vehicles has the following properties: Pinout Pin 1 is nearest the pressure orfice. 1 +5v 2 Signal out 3 Sig Return (GND) The pressure vs frequency values are: in-Hg kPa Hz 0 0 159 3 10.2 150 6 20.3 141 9 30.5 133 12 40.6 125 15 50.8 117 18 61.0 109 21 71.1 102 24 81.3 95 27 91.5 88 30 101.6 80 The accuracy of the sensor is +-3 Hz