Hello Eddy! My 1967 Frigidaire Imperial had an infinite water level switch. It is done via a metering chamber. A small hose carries a percentage of the fill water straight from the fill flume down to a small container with a pressure switch. With the Frigidaire, the trade off was that the pump could not operate during the "lint away" overflow periods because if the pump were to come on, it would drain the metering chamber. This meant that unlike time fill Frigidaires that did not shut off the water during the rinse period, the 1967 Imperial filled for rinse, shut off the fill water and began agitating. A couple of timer clicks into the rinse, the fill water would start flowing again. but it was no where near as much of an overflow rinse as in time fill machines. Once I tried to reset the timer to repeat the overflow portion of the rinse and wound up filling the outer tub to the point that when it went to drain, the tub was dragging in the overflow water even before the water in the tub was spun out to the outer tub. So Not Good.
Some Norges used a metering basin also. I remember reading the Troubleshooting section in the owner's manual for one. Under "Machine will not fill" was the suggestion that the collector basin might still contain water from an incomplete or shortened spin. The solution was to set the timer for a final spin to let the water be pumped out so that the pressure switch would reset.