Well, let me say first off this is a tough one.  A lot of people have said to get the Murkur harness since it is designed as a "stand alone."  Others recommend I believe it was the '86 harness as second choice.

 I didn't follow either recommendation .  My T/C was an '88 also with ride control and ABS.  I completely pulled every bit of the harness and laid it out on the ground (It must weight about 35 pounds by the way). Then I spent a LONG time disecting out what wasn't needed.  I'll bet I had over 50 hours in that process!  All the stuff around the dash center area and steering column really gets jumbled (see attached picture).

One thing I did do was keep the T/C fuse block and basically wired it as a separate entity to the battery.  I also used the T/C steering column, retained the cruise control and intigrated as much of the dash gauges as I could.

While I have not found a wire I shouldn't have cut, I still have about 15 or so wires I'm still trying to figure out if I can get rid of or not.  My car started on the first go, but I have had driveabilty issues - whether they are wiring related or not I'm still not sure.

All the best, but frankly there is no simple "do this" process.  It is more of a "journey of discovery."

Tom