Do I need a stat with a PWM controlled E-pump?

Davis-Craig electric pump didnt need a thermostat as it was PWM controlled by a thermo switch. Im running a Mezier electric pump and want to do the same: PWM speed control of the pump and run no stat. I have a fabbed LA sheet metal intake with no stat provision (TB interference), only 2 Russell 12 AN 90 water outlets at the front corners to radiator.