TM 10-6640-238-13 3-18 3-6. PRESSURE RECORDING GAUGE. This task consists of: a. Remove b. Install c. Calibrate INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Materials/Parts Required Lockwashers, (15) Equipment Conditions All inputs to pressure gauge disconnected. REMOVE Remove Pressure Recording Gauge.  See Figure 3-3. a. Remove 12 screws (1), lockwashers (2) and carefully remove pressure recording gauge (3) with three mounts (4). Discard lockwashers. b. Remove three screws (5), washers (6), lockwashers (7), nuts (8), and wall mounts (4) from pressure recording gauge (3).  Discard lockwashers. c. Refer to TM 10-6685-365-13&P for adjustment or repair procedures required for the pressure recording gauge. INSTALL Install Pressure Recording Gauge.  See Figure 3-3. a. Install wall mounts (4) on pressure recording gauge (3) and secure each wall mount with screw (5), washer (6), lockwasher (7), and nut (8). b. Align three wall mounts (4) and secure each wall mount with four screws (1) and lockwashers (2). CALIBRATE Refer to technical manual listed in Appendix A for calibration procedures.