Thought this got answered earlier.

You need to run the vacuum from a carb base fitting - you can use a "Y" if you don't have a spare one. Use a nice tight-fitting hose. That's it.

Then you need to adust the gap between the actuator bolt and the throttle arm using the in-out of the bolt by trial and error so that you get the right RPM increase when the AC comes on.

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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