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 a 1/8in. & 1/4in. NPT fittings and 6 foot nylon tubing.