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Good video and nice chart. Downloaded the chart and printed it out. Going to have it laminated.
What about a flathead Mercury motor, master cylinder is under floorboard?
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.