Abstract: The present invention provides a flight instrument apparatus and method for its use in air vehicles having an indicator visibly displaying angles from zero lift and having a data port for electrically exporting angles from zero lift wherein pressures from wing ports and pressures from the pitot and static ports of air vehicles are sensed, converted to digital data and mathematically divided one into the other to give a coefficient of pressure which varies uniquely with angles from zero lift of the air vehicle and which is used to calculate the angular deviation from angle of zero lift using a known relationship between the coefficient of pressure and the angular deviation from angle of zero lift.