Transmission fluid temperature is the single biggest contributing factor to the lifespan of your automatic transmission. Having an accurate, real-time measurement allows you to know when to downshift or when to take your foot out of it. Whether you're towing or simply trying to harness the power of a built or boosted motor, auto meter's trans temp gauge will give you the most accurate possible measurement for the exact temp of your trans fluid. A single wire 1/8" NPT temperature sender included to be installed in your transmission, transmission pan or with an optional transmission cooler line manifold is available for easy installation into a transmission cooler hard line.