Are instructions available for DDX?

Product description: DDX - Holley EFI Interface Module for Holley Terminator, HP, Sniper, and Dominator EFI Kits

Yes. You'll find a link to the instructions below the photo of the product.

DDX

By following this link, you can access the instructions in PDF format: DDX - Holley EFI Interface Module for Holley Terminator, HP, Sniper, and Dominator EFI Kits