Dc Control. It's a stand-alone PWM controller. You decide on your target temp and it will spin the fan as much or as little as needed to keep you at your desired temp (assuming the fan and cooling system have enough capacity).
Dc Control. It's a stand-alone PWM controller. You decide on your target temp and it will spin the fan as much or as little as needed to keep you at your desired temp (assuming the fan and cooling system have enough capacity).
The "Best aftermarket fan switch" and cheap do not generally go together.
The Dc Controller will probably be out of your budget. You can google DcControl.com if you want to look at Brian's products (he only sells to select groups, like Stangnet members).
For a fan switch itself, check this out. I'd use the 195/185 if you have a balanced 180* t-stat. Note that I haven't used this product, so check sizes and application specific info before ordering.