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 - Museum Coverage: The Stuttgart Agricultural Museum - by Cindy Ladage. While cold wind was blowing back in Illinois, in Arkansas, daffodils were in bloom, and the Magnolia trees were adorned with fragrant blossoms. Stuttgart, Arkansas was the site of this year's winter Minneapolis Moline Collector's show February 25-27, 1999. The show was held at the Oliver Museum created by Don Oliver, the pioneer of the four wheel drive tractor. Oliver along with Gale Stroh and Kenneth Bull using Minneapolis Moline tractors and parts created what has become known as
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