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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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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