Choose Options P3 Cars P3 Boost Gauge - Audi A3/S3/RS3 8V $259.00 **Fits Both Early and Facelift A3, S3, and RS3** P3 Boost gauge Hard-wires in to power and ground and requires analog tubing to be run and connected to intake / charge pipeĀ (does not plug into OBD2... Compare Choose Options Add to Wishlist