In this Part 2 of the AA80E 8-speed ISF trans swap into my MK4 Supra, I’m focused on the stuff that usually makes or breaks these conversions: wiring, sensors, and real-world fitment. Getting the transmission physically in the car is one thing—making it talk to the rest of the chassis and not throw a fit is the part that eats your time. I walk through the mindset I use in the garage to keep it clean and serviceable, because I’m not into hacks that turn into nightmares later when you’re chasing a no-start or a weird limp mode issue. I also go over the practical fitment details you need to think about when you’re marrying newer Toyota/Lexus hardware to a MK4 chassis. That means paying attention to sensor placement, routing, connectors, and how everything sits once it’s actually bolted up. The big takeaway is simple: plan the wiring like you plan the mechanical side—measure, mock up, and don’t assume anything is “close enough.” If you’re trying to build a Supra that you can beat on and trust, this is the part you can’t skip.