I have a harness and a cluster w/boost guage. I also have a lot of other 03/04 cobra parts. I'll be listing them tomorrow in the classifieds.
Dumb question I know, but I've always wondered... What exactly do you need to use an 03-04 cluster?
I kept my 98 computer and converted to COP. Have your tuner change the dwell cycle to what a COP car would use. The wiring is a lot of wires but not too difficult. Unwrap the coil pack wires from the engine harness and start labeling things.
I ended up unwrapping the tape and putting wire loom on them and then taping the wire loom. I didn't grab any photos but it looked much better.
Here's the wiring which I got from tccoa.com:
https://docs.google.com/Doc?id=dgcxhnzw_12c5z2qfhp&hl=en
Ok, so to clarify, it looks as though the original coil packs plugs have 5 wires? One hot and one signal wire per cylinder?
Any chance you could supply a bit more detail?