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JasonG · 10-03-2011, 09:50 AM

What you need is called a "Magnehelic gauge"
Get one calibrated for 0-2" or 0-5"WC.
They must be held vertical to work correctly but won't spill or slosh

10-03-2011, 09:50 AM	#5 (permalink)
JasonG Master EcoModder Join Date: May 2009 Location: Charlotte NC / York SC Posts: 728 05 DMax - '05 Chevrolet 2500HD 90 day: 18.48 mpg (US) Thanks: 120 Thanked 56 Times in 52 Posts	What you need is called a "Magnehelic gauge" Get one calibrated for 0-2" or 0-5"WC. They must be held vertical to work correctly but won't spill or slosh __________________ I can't understand why my MPG's are so low..........