Thanks to all for the responses; this is my first post on here and I do appreciate the help.

Steve: I do not disagree (now) about getting the part from the mechanic; I wouldn't be in this position had I done that. I was just so sticker-shocked that a daggone wiring harness was almost $1100 that I was determined to save a little; it backfired.

Tan Man: You mention the 24 and 26 wire harnesses; the mechanic said he took the old harness off, wire by wire, replaced it with the wires of the new harness, and came up 2 wires short. It would seem very likely that I got the 24 wire harness and needed the 26? I will try to sort through that with the supplier. Also, you asked why it was being replaced. It was crumbling in places and I was getting occasional bad misfires that we could not attribute to anything else.