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A digital voltmeter would be cheap and easy to install but will only work to show you vacuum at a 0.5 second sample rate or whatever the voltmeter does. So with that you will not be able to see any jitter or needle vibrations from an engine problem.
You can find a cheap diagnostic type vacuum gauge at advance auto/autozone for under 20 bucks that works great. It isn't backlit but that would be easy to wire in if you need it. The great thing is you can see a lot more about how smooth your engine is operating with that needle than you can measuring any sensors. You can tell when it is time for a tune up or any small vacuum leaks that would be impossible to detect otherwise.
Either way will be good enough to help control your throttle and improve mileage but with a vacuum gauge you can get a lot more information and keep your car running in top condition.
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