Pro-Comp liquid-filled gauges are designed for racing applications that may experience extreme vibration or violent pounding. The bourdon tube gauge mechanism is encased in a special dampening fluid to provide super smooth pointer movement for any style of auto racing, baja, or off road competition. Each gauge features the preferred 270deg in.full sweepin. dial design for the enhanced visibility Auto Meter customers really count on. Brake Pressure 0-2,000 p.s.i.. Includes T-fitting and 3/8in. OD x 1/8in.-27 NPT fitting. Use only approved brake line (not included).