at idle it is a measure of manifold vacuum and should be all the way left unless you have vacuum leak issues.be sure to check the three way connection going thru the false firewall by the booster.that baby gets hard as a rock and leaks.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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