MG sounds you can get from any hollywood movie. Todays mgs, other then cal 50 have a different sound. Turret sounds....every tank sounded different. Early German was manual and Panther-Tiger had to have the engine running as power came off a drive shaft under the turret...no engine, no power traverse. With engine running, turrret sounds wouldn't be heard. [:-]

US Tanks in WW II generally had an electric whine. M-26/45/46 had electric traverse motor which gave off a loud whine. M-41 had a very loud, high whine. M-47 lower pitch and an electric/hydraulic traverse motor..with the occasional scream from the accumulator. All M-48s had a hydraulic setup with a loud &%!^%$#*& accumulator which always cut on when you wanted everything quiet. [:@]

You could probably get close to a Sherman turret traverse motor with an electric drill. It can be two staged, with high speed for aquiring the target and slower speed for final lay when he's in your periscope field of view.