I don't understand how you can be using a pressure gauge (PSI) to read vacuum, unless you have one that reads in negative numbers. Vacuum should be read in Inches/HG (Mercury), which is something like a barometer (milibars)

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.