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An inclined manometer is more accurate at low pressures, BUT it needs to be accurately leveled. That's not practical in a car where you are driving on a cambered road, turning, and accelerating. Try the simple U-tube first, make sure the two tubes are right next to each other, and see what happens. I suspect that it will be accurate enough for your needs.
If you want spiffy, get a Dwyer Magnehelic gauge.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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