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With a max of 18" being measured at the source it would appear you have a pump issue.
Having said that please redo the test. Leave the booster hooked up and connect your vacuum gauge to one of the two small outlet hose ports in the main vacuum line.
Pull the other line and plug that hole in the main line.
Remember when your working on vacuum connections they are plastic, 30 year old baked plastic fittings that are inclined to break.
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1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T
"If you dont have time to do it safely, you dont have time to do it"
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