Recently got around to replacing my master cylinder and leaky booster. Hooray!
In the process I realized that the brake safety switch (at the brake line distribution block) has not had a wire connected for as long as I've owned the car. Can't find any stray wires anywhere and am wondering how/where exactly this switch connects to the circuit/harness. I have the "brake" light on at the dash when my parking brake is engaged so the rest of the circuit seems to be functioning properly.

ps- I've forgotten my password here but neither the "forgot password" link or a "help" form to the mods have generated any email response (yes, obsessively checked and re-checked all spam and junk folders). Any suggestions welcome.