I believe the sender is just a normally closed pressure switch that when their is enough restriction, the switch opens and lets the gauge default to the red zone. I don't believe the gauge will read anything in between red and green, just red when the vacuum switch opens, green when it is closed, so the gauge will read green until their is enough restriction vacuum to open the switch, then go full green to full red.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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