The vacuum connection on top is a vent and should not be connected anywhere it it's like anything I've ever seen.

On the WUR, you should have a connection on the back that goes to the intake manifold just below the FD via a three-way connector and a temp switch, and one in front that goes to a four-way connector.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe