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The vacuum gauge only really helps me that much because the SG was so jumpy with the Metro. Every other car I've had has worked fine with the SG and the LOD gauge. The MAP gauge worked on the Metro, but it was just too jumpy to get a good accurate reading on it. The vacuum gauge fixes that for me.
Something else I should just try quick to see how it works is add a small can (to act as an accumulator of sorts) where the vacuum gauge is currently hooked up. Disconnect the vacuum gauge and see if the can smooths out the MAP reading on the SG. That might be a much easier route to go actually.
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