The Ford Barometric Pressure sensor found on all MAF 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 17.1 58 122.4 18.3 62 125.5 19.5 66 128.7 20.7 70 131.9 21.8 74 135.1 23.0 78 138.3 24.2 82 141.8 25.4 86 145.4 26.6 90 148.9 27.7 94 152.5 28.9 98 156.1 30.1 102 159.6 31 105 162.4 The accuracy of the sensor is +-3 Hz