How-to Tuning Collaboration

[LeMarky Dissod]

Do you mean this one? http://www.tunercat.com/cables/lt1kit.html
Don't I need the obd2 cable to fit my existing adapter?
Either way, I'll probably get the Y package.

Yes.
If you want to communicate with the OBD1 pcm, you want an OBD1 cable, even if that OBD1 cable has an OBD2 adapter on one end of it.
If you get the 'Y', this becomes moot.