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No they are two separpate items. ITs recommended that both be needed if you get the fan switch.
The fan switch is just the switch that activates the cooling fan at whattever temp mugen sets it at.
The thermostat is just that ..mugen thermostat has a preset operating temperature which is lower than oem which regulates temperatures.
Truthful, its not necessary unless the car is driven in very had consistantly.
If you plan on tracking a couple times a year, then its a good idea to get one.
If u just plan to track once in a blue moon. Dont worry about it.
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