Pro-Comp liquid-filled gauges are designed for racing applications that experience extreme vibration or violent pounding such as Baja or other off-road applications The bourdon tube gauge mechanism is encased in a special dampening fluid to provide super smooth pointer movement for any style of auto racing. 270deg in.full sweepin. dial design for enhanced visibility. Includes 6 foot tubing, 1/8in. NPT & universal T-fitting.