This is good to know. I'll probably go with one of the L67 adapter harnesses anyways so I'm not too worried about this, plus I have an extra L67 MAP taking up space in the garage. Might as well use it...
I'm going to add another note for anyone that comes across this in the future. ZZP says that the adapter they sell will use pin 77 on the clear connector for 98+ vehicles. After looking at my wire diagrams, this should be pin 23 on the blue connector for 97 models.
I'm going to start working on the diagrams for the tranny next so more info will follow.