Plug in the power supply. The power supply may come with its own power cord or you may need to purchase one. Make sure the cord and the supply are the correct voltage for your outlets.
Plug the foot pedal into the tattoo power supply. Move the foot pedal away so it cannot be accidentally activated while setting up the machine.
Attach the clip cord to the face of the tattoo power supply unit. There will be an area for the clip cord to be attached near the power settings for the machine.
Attach the prongs of the clip cord to the upper and lower binding posts of the tattoo gun, near the coils. The prongs should attach securely and not come unhooked when the machine is moved.
Press the foot pedal to test the machine. The needle should move smoothly and rapidly. Adjust the power supply settings until the machine runs smoothly at the desired speed for your piece.