Electric vacuum pump is the solution for engines with high lift cams. Man of the older cars have engines that have been updated. The low vacuum does not support boosters, wipers and other vacuum operated controls. so to make them all work , the vacuum pump is the easiest way to fix the problem. Typical vacuum requirements are 18 inches of Vacuum.
Vacuum pump is was developed and is made in Spain, not China
Relay is designed to work with vacuum loss and your brake pedal switch