I installed a vacuum gauge tonight. I tapped it off of a "t" I put in near the intake manifold on the line to the cruise control. When cold and at idle the needle vibrates like nobody's business, fully 50% off the guage face. As the engine warms the vibration lessens in amplitude by about 50%. Yet it still beats out a path across the gauge face. It is almost invisible it moves so quickly. As I give it some gas it evens out. When warm, and under load it seems to hold near steady, no vibration anyway.

Anyone have clue what I'm supposed to read or understand from this activity?

I found this http://www.centuryperformance.com/vacuum.asp but it seems to be a domestic engine oriented place. Maybe the bricks are different.

Thanks in advance. Get it? ;)
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1985 244GL - St. Joseph, Missouri