At this point, if you want other specific pics just PM me or email me.  The back seats are not discolored.  The sun is making it look like glare / shade differences on the passenger rear seat.
Feel free to contact me with any questions.

these might be better than those posted last night

Sorry for the glare in some of these pics.

Interior shots tomorrow

I will post a couple more tomorrow with better daylight.  Any specific areas requested?

http://indianapolis.craigslist.org/cto/1828297321.html

Besides what is listed in the add, specifics that guys on this forum would understand:
HUD works but is stuck on start screen
DIC works flawlessly and has a beautiful screen
Instrument cluster and gauges work (no warning lights, etc.) but speedo is off by about 15 mph
Multi-function seat adjustment pod in armrest works
Dash is crack-free
Performance Chip tuned by Adam (flybynite on the forum)
I re-located the coolant overflow to make room for the cold air intake

The not-so-good:
Surface rust on trunk where someone attached the spoiler
Couple minor body work places on the hood
Two small places where clearcoat is starting to peel
Back seats are in great shape, passenger front in good shape, driver's seat is fair (I've seen worse)
AC is not charged, but the compressor, receiver drier, etc. is all there
Paint is still very shiny and reflective, but is not perfect

Extras to go with the car:
1989 Grand Prix Service Manual
1989 Turbo Grand Prix supplement
1989 and 1990 Original Pontiac brochures (featuring the TGP)
Magazine ad for the TGP out of Hot Rod magazine, Feb. 1990 (in a plastic protective sleeve)
Collectible Automobile magazine article from August 1990 on the TGP (in plastic protective sleeves)

Pictures and further details available if anyone is interested.

Does anyone know what GM called the tan color for the TGP interior? Mocha? Saddle? Prairie Tan? etc.  I'm trying to match up some floor mats online and want to come as close as I can to matching.  Thanks.

Thanks for the help and the info guys.  I think the Pull-a-Part here charges about $55, but of course that is if you can find one!  Sorry for showing my ignorance, but am I right in assuming you cannot interchange a 16126823  for my 16159331?  I'm anxious to get this car on the road.  It had been sitting for a long time and this forum has been very helpful re. injectors, vacuum issues, brake accumulator, etc.  I'll keep you posted!

Yes, it is under the passenger's front seat - encased in a black plastic box.  Thanks for checking.  You can reply here or PM me.

I need an ABS control module (computer) for my '89 TGP.  Re-manufactured service number: 16159331.  I know they came on various w-bodies, Buick Regals and some Bonnevilles between '89 and '91.  Searches at local junk yards haven't turned up anything, so I thought I would post and see if someone here had one they would be willing to sell.  Thanks!