I want to install a tranny temp gague, but dint really know how. I installed an external cooler and want to tap into the rubber lines if possible. I know I need a sending unit and a gague. I just dont know what the sending unit does or how to hook one up. I am confident I can do the install if I had some directions as I have done everything to my truck myself. I just want to make sure I know all the parts I will need and have an understanding of what needs to be done before I start. Thanks guys.