Steve, The vacuum port for the fuel pressure regulator on my 91 is just below the power brake booster on the engine's driver side of the intake manifold. I believe that is the only true vacuum port available. I inserted a tee connector to the hose for the vacuum gauge. My engine reads 13" now, it has run as low as 10.5". I'd say 11- 13 is about it for a boxer at idle. Sincerely, Mark Keller 91 Carat Cowichan Bay, BC |
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