Actually, I think the vacuum reading can be used to determine how clean the air filter is...like, if you're seeing very much of a vacuum at idle, that means the engine's working harder to pull air in. Just a thought...
Also, where are you planning to mount this? I would like to put in a boost gauge along with a pyrometer, but I don't knwo where to locate the gauges where they would fit in with the rest of the interior...?
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