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 - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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