Hi

I am correct when i state that on this performer 289 manifold the number 1 hole is for the vacuum which goes to the automatic transmission , and the number 2 hole can be plugged ?

Thx
Mike

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They are both vacuum. Use the one you want and plug the other one.

 

You might want to install a "T" and put a rubber nipple on the one you don't use. You may need a vacuum source somewhere down the line.