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Either somewhere in the water pump housing or right in the top of the thermostat housing is the best spot for it. That is where the coolant is the hottest just before it goes to the radiator. On my S4 NA the thermostat housing had a spot on it for the factory thermo switch that wasn't drilled or tapped. I installed my switch there. My TII has a factory electric fan and that is where Mazda installed the switch for it.
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1976 Rx-4 hardtop. Half bridge 3B 13B, S5 NA rotors, Renesis e-shaft, stat gears, and bearings, balanced rotating assembly, RE dual weber 36 DCD's 203rwhp 137ft-lbs torque DGRR 2011 3rd place
1974 Rx-4 all original 27,000 miles
1988 Rx-7 TII 320rwhp. DGRR 2012 3rd place
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