I regretted tearing apart the interior of my MR2. But it just had to be done to figure out what wires I needed for the Blacktop ECU.

I had to tap into the radiator fan, blower, and defogger wires for the Electrical Load Signals on the ECU (ELS1, ELS2, ELS4). ELS3 for the taillights is already pulled back to the trunk on the MR2 harness. Fortunately, all 3 were available at the passenger side kick panel. Unfortunately, that's like a mile back to the ECU. Good thing I kept all the harnesses from the Trueno and was able to match up the colors pretty well.

To access the passenger kick panel, I had to remove 2 parts of the ventilation system. This gave me the opportunity to remove the evaporator from it's section, since I'm not going to be running AC. Here's pices of the evaporator:

When I opened the ventilation system, there was this orange insulation/sound deadening stuff on most of the flaps. This was virtually disentegrating, and getting all over the place. So I scraped and vacuumed as much of this up as possible. I also fixed a slight problem with the recirculate/fresh air flap. It used to make a loud thunk when moving to one position. A slight bend of the metal flap cured the problem.

Here's some pics of the blower and evap sections removed so that you can see the wiring looms.

Since there wasn't any way to tap into the connectors that come into the junction box, I found matching 4-pin male/female connectors. I spliced into the 3 appropriate wires, soldered the connections, taped them with fancy red tape, then re-wrapped the loom with standard black electrical tape. Here's the junction box & loom with the new connections, before and after taping.

The side that plugs into this (and runs to behind the driver's seat) is already built and is sitting on my garage floor ATM. Just need to clean it up, and retape the loom.