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A vac gauge is somewhat useful depending on how aware you are of your driving. You have to be completely honest with yourself also. If you are extremely aware of what you are doing a vac gauge won't help, but since you're relatively new here I think it would help alot.
the other devices people here recommend allow more useful data for modding. They can tell engine load and fuel consumption so its immediate feed back and it can provide useful data about aero improvements and tests to see if one method is better than another.
Depends on the car for what you want to use to attach a belly pan. some short screws into the side skirts/front bumper are usually pretty easy
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