This water temperature gauge from Stack combines the best features of an analog gauge with the best features of electronic gauges. The 270 degree sweep dial face is easy to read, especially when you don't have time to decipher numbers. The microprocessor-controlled stepper motor gives fast, accurate, and rock-steady needle movement. Electrical sensor (included) is also easier to install than capillary tubes. Common 52mm (2 1/16") diameter. Black face, black bezel, and white needle.