Also, I re-read my original reply. I didnt mean to charge through the high side on the car obviously. But in a jam if the HF charge hose wont fit, you can vac and charge through the high side of the HF manifold, with the low side connected properly to the car. But better off getting the proper can tap to match the hose if you have time.

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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI

Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D