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My bulb just burned out on my vacuum gauge, so I am going to pop in a new one tomorrow. I was thinking of using a red or blue bulb instead. Maybe.
One thing good about this gauge is it will warn you of any engine problems right away! I had a vacuum line break on me while I was driving and my gauge was acting funny. It was fluctuating rapidly at idle and was not reading right when cruising. After fixing the line, it's all back to normal.
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