Hmm it seems I can't just grab a cheap harness and throw the deck in like I thought. I think I have to get one of these things
as well as the PAS SWI X (if i want to keep the steering controls).. who knows what else I'm getting into all this GM data bus stuff is a little beyond me.

Thanks for the tape tip soundman but the one I tried seems to have screwed the tape deck into thinking a tape is always in now. I suppose if I pull the deck to try to tinker with it/reset it I'll have to worry about the lockout/security codes etc.. what a pain..
Maybe I'll just try and find a decent fm modulator..