Auto Meter 2-5/8 inch (66.7 millimeter) 0-15 PSI Mechanical Fuel Pressure Gauge with Isolator. It features bronze bourdon tube 270 degree sweep movements and durable nylon gearing that make these rugged and long lasting gauges a proven high performance favorite for over 25 years. These mechanical gauges require no electrical power for operation making them an ideal choice for vehicles with no or low powered electrical systems. Includes 4 feet braided stainless hose, also require 4 braided hose to connect isolator to fuel source.