Installed the under dash harness to the back side of the dash. The harness is made by M&H Electronics in Santa Fe springs and sold by Year One. It's a very nice reproduction which accurately matches the original harness. However I did encounter some missing features during the install.
The fuse block in the new harness was missing a fuse holder. In my car that fuse powered the air conditioning. I called M&H and got some excellent technical support. He talked me though transferring the fuse holder from my old fuse block.
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The under dash courtesy lamp is not included, nor is the pigtail that connects the courtesy lamp to the cigarette lighter. Had to repair mine and use it. There is a connector on that wire that I would guess is to feed a glove box light.
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The wiring the goes to the floor shifter console and feeds the backup lights is also not included. Salvaged my original and installed it. The purple wire was added to the connector for the rear light harness.
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The windshield wiper wiring in the M&H harness is setup for single speed wipers. Dual speed wipers were optional and used additional wires outside of the harness. I parted out another 65 that had dual speed wipers so I grabbed the wiper switch and additional wires out of that harness.
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The power wires for the radio also run outside the harness from the fuse block to the radio. One wire is for power, the other is for the light in the radio dial when the headlights are on.
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There is a separate harness for the convertible top
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In each of these cases, the missing wiring was not part of the original harness and ran outside the harness. Where necessary, I was able to install the old wiring into empty positions in the plugs, fuse block or bulkhead connector of the new harness. Ideally, the new harness would have included everything one might need so one could omit the parts not used on ones car.
The moral of the story is to save all your wiring because much of it is not available as reproduction and has to be cleaned, repaired, and reused. I found soda blasting to be an excellent method for cleaning switches and connectors. I cleaned the individual wires with acetone.