This mechanical oil/water temperature gauge gives high performance with a great racing look. Blue-line styling against the black 2-in dial face with white digits adds style and readability to its look. It has 12-volt internal lighting and is designed for negative ground systems. It includes 72-in capillary tubing with 5/8-in national pipe thread and 1/4-in, 3/8-in, and 1/2-in adaptors.