Disconnect the oven from its power source by unplugging the range or turning off the breaker switch.
Access the control panel wiring; its location can vary depending on the model of the unit. Refer to your service manual if you have trouble locating yours because some are on the back panel while others are under the main cook top.
Remove the knob by pulling it off. Remove the screws you’ve exposed by removing the knob.
Remove the regulator switch from its seating, leaving the wiring connected to it, and put it aside. Screw the new regulator switch into place.
Using pliers, disconnect each wire from each connector in the old regulator and connect it to the identical connector in the new switch, including the one to the oven probe. Replace the screws to attach the new switch to the unit. Slide the knob back into place. Replace the main top if you removed it to access the assembly.