I believe (though am not certain...) Case equipment of that era uses 2 pole, magnetic movement gages. They were manufactured by either Stewart-Warner or AC (General Motors). There is no "instrument voltage regulator" required for this type of gage - they are by design self-compensating for voltage.
Thermal gages (which use a pulsing instrument regulator you describe) were used by Ford, Chrysler, IHC and others.
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