I'm gonna put a water temp gauge on my 06 500 it's electric does anybody know what sending unit I should get to fit the water outlet the gauge is a 1 1/2 gauge from Summit got it from a friend and he can't find the sender thanks

 

I believe you will need a 1/8" pipe water temp sensor . Your local automotive shop like Napa should be able to help you out . I installed my 1/8 sensor in my thermostat housing I just drilled and tapped .