HTF WWII USAAF USN 4 engine acft no. 3 & 4 manifold pressure gauge AN 5770-2-34

harder to find WWII 1942-43 dated AN 5770-2-34 4 engine aircraft dual manifold pressure gauge specifically for engines 3 and 4.  The 1 and 2 engine gauges are proper for 2 and 4 engine aircraft and are more common... the 3 and 4 gauge is a little harder to find.