to pull a vacuum on your A/C you need an A/C recharge machine which costs at least a grand for a used one and new one is like 2 to 3 grand.

this will work too

http://buy1.snapon.com/catalog/item.asp?P65=&tool=all&item_ID=11447&group_ID=1523&store=snapon-store&dir=catalog

http://www.sjdiscounttools.com/rtirhs680r12.html

is more what your lookin for

http://www.sjdiscounttools.com/rtiac800.html

that plus a freon identifier

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)