Oil temperature dip stick fits Softails 1984-1999 and Sportster 1982-later. Probe length is 2 1/2 inches. These highly accurate gauges quickly respond to oil temperatures up to 350 degrees Farenheit and give continually accurate reading of the motor oil temperature, enabling the rider to tell at a glance if the oil is overheating, and by how much. Made to fit into oil tank in place of present cap. Sold each.