Classifying Instruments Navigation Instruments Pressure Measuring Instruments Types of Pressure Pressure Instruments Manifold Pressure Engine Pressure Ratio (EPR) Fuel & Hydraulic Pressure Vacuum Pressure Pressure Switches Pitot-Static Systems Air Data Computers (ADC) and Digital Air Data Computers (DADC) Altimeters and Altitude Vertical Speed Indicator Airspeed Indicators Remote Sensing and Indication Synchro-Type Remote-Indicating Instruments DC Selsyn Systems AC Synchro Systems Remote Indicating Fuel and Oil Pressure Gauges Mechanical Movement Indicators Mechanical Tachometers Electric Tachometers Synchroscope Accelerometers Stall Warning and Angle of Attack (AOA) Indicators Temperature Measuring Instruments Electrical Temperature Measuring Indication Ratiometer Electrical Resistance Thermometers Thermocouple Temperature Indicators Turbine Gas Temperature Indicating Systems Total Air Temperature Measurement Direction Indicating Instruments Vertical Magnetic Compass Remote Indicating Compass Solid state magnetometer units Solid State Magnetometers Vacuum Systems Engine-Driven Vacuum Pump Typical Pump-Driven System Twin-Engine Aircraft Vacuum System Operation Principles of Gyroscopic Instruments Solid State Gyros and Related Systems Microelectromechanical Based Attitude and Directional Systems Common Gyroscopic Instruments Electric Attitude Indicators Gyroscopic Direction Indicator or Directional Gyro (DG) Turn Coordinators Turn-and-Slip Indicator Autopilot Systems