A vacuum gauge is a valuable tool in diagnosing problems with your car. From poor performance to bad braking, the vacuum gauge can help you find the root of many problems. Mark Simpson demonstrates how to perform an accurate engine vacuum test.
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Shouldn’t the needle be steady? It looked in the video as if it was shaking a bit. I am in the process of testing mine and at the beginning mine was shaking as well, but I had most of the vacuum hoses connected. Then my friend recommended to test it again after caping some of the vacuum ports and I got a steady reading.
What about a flathead Mercury motor, master cylinder is under floorboard?
Hello Ralph,
You can take a vacuum reading from any plenum port off the intake manifold (although not including, coolant passages or exhaust crossover passage).
I have also seen some carburetor base plates for Mercury have vacuum ports for Columbia two-speed rear axles.
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Good video and nice chart. Downloaded the chart and printed it out. Going to have it laminated.