I bought this to test the vacuum on a '74 Plymouth Duster with 360 and got aggressive. I had bad vacuum, so I used that to set ignition timing by ear. Increasing the time gave me more vacuum and this was evident as I watched the arrow increase. I have this tool in action on YouTube. You will see that the needle is quite elastic. I don't know if it's a tool or just my motor. I need to time and curve my MSD stick spreader even better. Here is the link to the video: [.]
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