manual fan switch install

[bauer2568]

I got a 2009 prostar with a 871 cummins. I want to add a manual fan switch. I have insite so id prefer to just buy a nice cheap switch vs a solenoid, and wire it into the truck wherever the stock one would've gone if possible, then use insite to enable the switch. I read another post for a volvo that sounded like it could be done pretty easy, so im hoping international made it easy too lol, im just not sure where to wire to.