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vacuum gauge use
As the throttle is opened on a carburetor engine, vacuum drops, and as the throttle closes vacuum increases. So, if one watches the gauge drop as the car accelerates, a slight decrease (backing off the throttle) can still give the acceleration needed but drop fuel consumption. Consider it the "sweet spot." Also, once the car reaches the desired speed, vacuum increases due to a drop in engine load. Driving at a given speed on level roads keeps vacuum high... therefore higher MPG. A vacuum gauge is an excellent tool for tuning a carb. motor, and I assume a throttle body that uses a throttle plate to control air-fuel mixture. A vacuum gauge can tell engine problems like bad valves, manifold leaks, bad carb gasket sealing, and dwell setting, plus more. Once it was a necessity in any garage/shop.
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