If you have elect fans you can use a 160* therm and still keep the engine at 180* bottom. The therm will stop the engine from getting cooler than the temp shown but does not always let the get to it. In my case even in 32* outside temp, intake temps of 32*, 160* them, elect fan on low at 185* the engine will not get below 175*-178* per my Aeroforce gauge.