Mechanical Transmission Temperature Gauge;140 - 280 Deg. F;Incl.8 ft. Tubing Or Wiring Harness; California Residents: WARNING Transmission fluid temperature is the single biggest contributing factor to the lifespan of your automatic transmission. Having an accurate, realtime measurement allows you to know when to downshift or when to take your foot out of it. Whether you are towing or simply trying to harness the power of a built or boosted motor, Auto Meters Mechanical Trans Temp Gauge will give you the most accurate possible measurement for the exact temp of your trans fluid. An 8 inch Capillary Tube with a 1/2 inch NPT mounting nut is included to be installed in your transmission pan. An optional trans cooler line manifold is available for another easy installation option.