Just bringing this back up, finished installing this morning. I had a great conversation with Redarc (they called me on their dime from AUS) and they assured me that the TPH-021 would work in my 2015. The better news is that they sell a complete kit that includes the Elite Pro controller, the TPH-021 harness AND the TPSI-002 dash insert as one kit, it is part #CIKTP-NA-002, same price as just buying just the controller, $250. I bought mine directly from Redarc, had it in about 4 days.
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LandCruiser / Sequoia / 4Runner / Early Model Tundra & Tacoma Brake Controller Kit
The REDARC LandCruiser / Sequoia / 4Runner / early model Tundra & Tacoma Tow-Pro Wiring Kit supports the installation of either the Tow-Pro Elite or Liberty electric brake controller, providing ‘plug and play’ connectivity into a range of Toyota LandCruiser, Sequoia, 4Runner, Tacoma and Tundra...www.redarcelectronics.com
I had no empty slots in the left panel, so I opted to put it in the panel to the right of the steering wheel. I can easily see it while seated. Plenty of wire, in fact the hardest part was fighting with the wires to get them fully tucked and safely ziptied under the dash, wow it's crowded under there!
Did you ground the white wire that's part of TPH-021?