Water Temp Mechanical Liquid Filled Gauge | High Performance Here we have the latest technology str competition mechanical liquid filled 2-5/8” Gauges with LED backlight. High accuracy designed for high performance applications for all aspects of motorsports. All necessary hardware included with easy to read instructions included; High quality oil temperature sensor and adaptors. Fitting size for temperature probe: 5/8” UNF Thread ( Adaptor to 1/2 NPT Thread also included in the kit). Available in: Water Temp, Oil Temp, Oil Pressure, and Boost PSI.