Quote:
Originally Posted by Sean T.
What exactly does a vacuum gauge do?
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It measures the vacuum at the intake manifold. As engine power increases, the engine generates less vacuum. The upshot is that a vacuum gauge can show you approximately how much the engine is putting out. In my case, for instance, when normally driving up the hill, I'd see between 0 and 3 inches on the gauge. By adjusting my speed and throttle a little bit, I'm able to climb at about 6 inches at nearly the same speed. Therefore, I'm using less fuel by being very subtle with the go pedal. The vacuum gauge gives me that instant feedback.