I have been planning to convert all our truck electric fans. I was hoping to build a standard wiring harness to work with all of them using common parts. I do not want to use a store bought fan controller because of their reputation for giving out. I believe I have found, what I consider, the best option for what I am trying to do. However, I cannot find a design that eliminates the probe that sticks in the radiator. I do not want to go that route. However, any switches I find either tie into the ECM or require some kind of special hardware or parts that are model specific. Any thoughts or suggestions of this?