i would like to see the nameplate on the motor. that would confirm or deny the use of a general power supply. i still believe it would need one because it in all probability was connected to an A.C. source.
just a guess because i cannot quite make it out is that the gauge on the left of the motor is a tachometer. i can only make out "per" as in revolutions per min.
the large meters are westinghouse, you can see the logo above the display. must have been labeled for wiedenhoff. they are the same type and design as used in our oldest substations and power plants. almost always solid brass mounted on green or black marble, the later used bakelite for a backer. all of the control panels like this used large rubber mats to stand on, and you always operated it with ONE hand!
lucky dog chris!!