I purchased the 6’ deluxe dishwasher install kit Best Buy model number 5304504505 $29.99 along with my Bosch 18” DishWasher and that’s all my Plummer needed to install it.
The kit contained all the hoses needed to connect. I did not purchase an electric cord separately. You can always purchase and return if not needed or used! I usually do that when I’m not sure if the cords are included.