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If your switch is on the left side of the column I would think you could just swap switches with anouther '87-'91 that has delay wipers, I recently replaced my switch in my '94 with a new one, it is a seald unit, which is not only your wiper/washer switch, but your high beam,turn siginals, and hazard lights as well,one with delay should just plug right in I'd think.
Sorry about that, I thought (without looking) that '87-'96 were all the same.
I would think then that your setup would be like the '73-'79 type style on the dash, so if you'll go to a wrecking yard and get the complete setup from a '87-'91 you should have no problem doing this swap, get the switch, and the delay box, which are together just behind the switch, behind the dash, it should be a plug and play type swap if its like a '73-'79, right Dennis??