Installing the Boost Sender for Vac/Boost gauges: Typically a vacuum/boost gauge would be used a gasoline engine that is capable of creating vacuum, These engines will most often have a full port manifold vacuum line that you can T into from either the base of the carburetor or throttle body, or from the intake

How do boost gauges work?

A turbo boost gauge is an essential piece of instrumentation that indicates the amount of air entering the combustion chamber. Air indication is measured as air pressure. The pressure of the passing air places pressure on the tube. The tubes internal pressure raises, and a deflection in the gauge is accomplished.