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With the rotary knob you will not have a Number 0 default position. You will not have seamless switching between tunes like the EX or Gauge switcher or LED number indicator. No start is not available.
If you already have an EX or Gauge switcher and you purchase the rotary knob to replace the EX or Gauge switcher you MUST send in your F5 or F6 chip to be reprogrammed to work with the Rotary knob switcher.