For what it is worth, back in the early 80s I drove truck. Sometimes I would have to drive one of the new International bobtails. Nice little truck 4 cylinder turbocharged engine. Any way it had a throttle control that had a lock in it. Pull out the throttle to the desired RPM and twist the knob. It would hold that RPM untill you released the lock. I spent a lot of hours using that poor mans cruse control LOL. Jimmie.
