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I will chime in with some mildly annoying clarification. Magnehelic is a model/brand of gauge which usually measures inches of water column. A more generic name would simply be inches gauge, low pressure gauge, or monometer.
To the OP, I would not attempt with magnets. I assume the idea is to not damage the vehicle but I would wager that neodymium magnets strong enough to do what you're asking may also lead to scratches in the paint.
Mounting it to somewhat disposable features like a tail lamp housing might be an option.
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