Adjustable electric fan thermostat question ?

I had two fans mounted on my hot rod radiator. One set to turn on at 180 and the other turned on at 195 (if it ever got that hot) with separate relays and adjustable reostats. With two fans there's always a back up if one fails.
I don't disagree, but you can use the thermostat I never will. LOL It's like pickled beets. I an't doin it. LMAO