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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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