ECS Tuning introduces a new and innovative way to install a boost gauge into your B5 Audi S4 2.7T . Designed specifically for the B5 chassis, this electronically-actuated gauge allows for easy and accurate monitoring of turbochargers boost pressure. Keeping track of boost pressure is a great way of consistently checking engine performance and a fantastic way of diagnosis power loss problems. This gauge allows visibility from the entire range of driver's seating positions. Included is an ECS Tuning 45mm digital boost gauge, manufactured and designed for outstanding performance and accurate boost readings. Kit includes: ECS Tuning 45mm boost gauge ECS Tuning vent gauge pod All necessary installation hardware, connectors, and lines See our convenient installation PDF for an easy install!