You might need this if you are not using a Cheyenne Power Supply.
Cheyenne Hawk Start-Up Facility cable is used to start the Cheyenne Hawk at the correct voltage IF YOU ARE NOT USING A CHEYENNE power supply.
This cable eliminates the need to start the Cheyenne Hawk at approx. 10-11 volts and then turn it down. It simply allows the tattooist to start the Hawk Thunder at their desired voltage.
If you are running the Hawk Thunder on a Cheyenne power supply - you do not need this cable.