2003 computer & harness, wish it were for a manual

[general23cmp]

I have the opportunity to buy a 2003 (and similar years) LS wiring harness. I was looking for a manual harness with a computer for a manual since I plan on using a non-computerized transmission in my conversion. I have heard that it is best to go with a manual transmission computer and harness for this setup to work easier. The problem is that the computer and harness I have found is for an automatic computerized transmission LS motor. The guy selling it stated that it isn't a big deal, that you just dont plug the automatic transmission wires in, and it will work. Is this true? I plan on reprogramming the PCM, so it being automatic isn't a huge deal, but I need the harness to work.

It's DBW and I believe these years had a seperate computer for an auto trans, but am unsure.

It's a good deal, or I would simply wait.

Help.

[Cutlass]

you can tune out all the automatic trans stuff and it'll work just fine