B-24 G, H, J Liberator Bomber Flight Manual and Erection and Maintenance Manual H-46 This is the type used

This is the type used on the Douglas A-20 Havoc attack bomber (see photo of instrument location on the A-20 cockpit panel as illustrated in its flight manual) as well as the C-45 Expeditor transport (both aircraft used 2 each)

but with markings for engines 1 & 2 or L & R

since all that is required of him is the proper response to its indicators without the necessity of making any mental computations

The AN-5773-1 Engine Gage Unit displayed 3 metrics with one instrument:  Oil temperature (from 0-150 deg C)

Approx 1 inch thick

B-24 G, H, J Liberator Bomber Flight Manual and Erection and Maintenance Manual H-46 This is the type usedThis is an original WWII era 109 page Flight Manual for the B 24 G, H, J Liberator Bomber and PB4Y Privateer dated August 1944, and an original partial (1 491 of 630 pages) Erection and Maintenance Manual for the B 24 D, G, H, J Liberator and PB4Y Privateer dated May 1944. The binder is missing its cover but still retains the pages.