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I think governors on road going diesels restrict ground speed, not engine speed, but things are changing fast. There could be some that restrict manifold pressure for all I know. There used to be mechanical/pneumatic governors that did just that.
The description of variable speed governors is not what we use for gasoline engines. A variable speed governor will maintain engine RPM relative to the setting of the throttle. WOT it will maintain maximum rated RPM. At half throttle it will maintain half maximum rated RPM, etc.
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