Adding manual fan switch

[1002]

Hello
I have read some topics on how to add the engine fan switch on prostar trucks, what I could observe in the prosthetic trucks with either engine cummins or maxxforce the parameter is already activated in the engine ecm the only thing missing is to buy a Switch and dock to the multiplexed switch pack, after that they should only use the diamond logic to activate that function .. save that information and send it to the bodycontroller.
I would like to upload photos of the procedure and be able to help activate that function to the members of the forum but I do not know if that is allowed
Please forgive any indiscrimination on my part