812 p7100 injection pump?

[sourmashpdx]

Hey everyone, I'm looking at a p7100 injection pump and can't find any information on what pump it is. The part number is 0402-736-812. I've searched everywhere and have only found one site listing it as belonging to a cummins. Besides that though I can't find any information on what this pump was for. I'm looking for one to use in my ~500hp first gen build and this one is a really good price. I plan on modifying the pump anyway, but I want to make sure I'm not mistakenly buying the wrong thing and from what I can tell there are a lot of different p-pumps out there. Any help would be greatly appreciated.