Entry level analog 4 valve manifold
Digital 4 valve manifold
The benefit of a 'digital' manifold system, that has a transducer which allows vacuum measurements in microns, will become apparent to you when you run into pump or system vacuum issues. Using the micron transducer to test your pump's capability, test your line set and manifold for leaks, test your vehicle system for leaks, and to insure the system is pulled down to a sufficient vacuum level.