If you don't mind a bit of cheating, you may have the best shot getting what you need from a pull-it-yourself wrecking yard. I had an engine fire in my '84 Nissan 300ZX, and I searched until I found one with what looked like identical equipment. I cut the engine harness a little farther back than I had to cut the one in my car, got the section of harness and all the injectors for under $50. (The most expensive part of the repair was new spark plug cables.) I cut the jacket on each harness back about a foot and made a checklist of wire colors. Several were the same colors because the injectors were wired in parallel, so they were interchangable. I used crimp splices in a staggered pattern to splice the wires together - took an afternoon to do it - and wrapped the area with black tape. It really didn't look bad, and worked until I traded the car in about 5 years later.
No matter which way you go about it, get the best wiring diagram you can find. Wiring colors is a must, and better manuals (like Mitchell and Helm) have ground locations. Finding a good one may be your hardest challenge. Don't forget to check what the local library has.
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