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I recently put a sending unit in the test port #3 of my 545RFE in my 2005 Dodge Ram 1500. With the Autometer gauge it reads just fine (170) on the highway but as soon as I get off and enter city driving it begins to spike to upwards of 240! I find it hard to believe that my transmission with 45K unabused miles on it is running so hot. Any ideas? When does the test port #3 fill with fluid? Also it is an AutoMeter 7349 gauge with LED lighting, any ideas of what resistance to use to dim the lighting on it? thanks