War Department Technical Manual Aircraft Instruments TM 1-413 printed 2 Feb 1942
This manual has exactly the pictures you need, including a very good diagram of a C-47 cockpit (page 4)!
It should be valid for all USAAF aircraft produced in 1942, and possibly later. Not only do you get halfway decent pictures, but there are also some diagrams, as well as information as to exactly how each instrument works. Really good stuff for a cockpit creator.
There's a free, high-quality scan here, which can be downloaded as a .pdf:
https://archive.org/details/TM1-413
Manual for USAAF Propellers and propeller pitch control equipment:
TM 1-412 Aircraft Propellers
https://archive.org/details/TM1-412