Gone but never forgetten
Join Date: Jul 2000
Location: Roseville, California
I beg to differ, but the shift selector light is a completely different circuit in '65/'66. The reason, is that the shift indicator light is lit only when the headlights are on (ok, technically, only when the dash lights are on)for a '65, and it's on anytime the key is on in a '66 ... either way makes it not a good place to hook up the console lighting.
There are 2 connectors under the dash for the console lighting (and this part of the wiring is the same for both '65's and '66's). The rear console lights will plug into black/blue female bullit connector under the dash and they operate with the rest of the interior lights. If you have a full console, the glove box light will connect under the dash to the green/yellow female bullet connector, as it can operate at any time, with or without the key on.
There is no "special underdash harness" for console equipped cars. All cars where equipped with the bullet connectors to hook up the console lighting, and simply weren't used on cars without a console.