injector harness wiring help

[incomplete]

so, i picked up a lindsey racing injector harness off of these boards, and i did note a difference in the pic i was sent vs. what was on their site: the fancy used one has four connectors for the injectors, while the lindsey racing site has five (knock sensor).

i'm planning on splicing this red bad boy in to my newly acquired 'used' harness. it's in gangloads better condition and like my car, only has four injector sockets:


here's the lindsey racing harness, also note four sockets:


and their instructions: INJECTOR HARNESS at LINDSEY RACING - Your Porsche Performance Parts Center

my car also only has four. no knock injector on the harness proper.

here's my question: my harness has three wires -- red, blue and black. i'm assuming 2 positives and a ground... correct?

next up, which harness does the injector run through? the DME, or KLR?

and finally, which pin-outs/number does each color correspond to?

or, ultimately: what harness do i have, and is it better than what i have?