The P-51 Mustang by Len Morgan, Famous Aircraft Series F-82 Here is a Fuel Pressure

Here is a Fuel Pressure Indicator for a dual engine aircraft (or two used for a 4 engine aircraft)

known in the US Air Force as the Type E-4 autopilot system during the late 1940's and 1950's

Here is a WWII-era Aircraft Spotters Handbook published in 1943 by the National Aeronautics Council for use by civilian air observers

and there are no apparent leaks

At both top and bottom of the compass housing are compartments for compass correction rods

The P-51 Mustang by Len Morgan, Famous Aircraft Series F-82 Here is a Fuel PressureThis 92 page book was published in 1979 as an overview of the P 51 Mustang Fighter. It contains both descriptive text of operating the aircraft as well as background on its development and deployment. It also contains a condensed version of the 1945 Pilot Training Manual.