Keep an eye on your boost pressure with APRs vent mounted boost guage!
APR Boost Gauge for Audi B5 A4 and B5 S4
The APR Boost Gauge utilizes a VDO boost gauge contained in a vent-replacement pod. The pod was designed on the computer with Pro-E for the best in fit and finish, giving you a factory like look and feel. The gauge itself is a 52mm mechanical VDO gauge giving very accurate and reliable boost and vacuum readings. The APR IN11000 boost gauge reads from 30 in. Hg of vacuum to 25psi of boost. For higher boost systems, the APR IN110002 0-30psi boost gauge without vacuum reading is available.
APR's Vent Boost gauge can be mounted in any of the 3 center vents on the B5 A4 or B5 S4.