That button at 2:51 is AT thing I think. It is called kick-down switch. It is used to detect that driver is trying to move pedal beyond usual limit, so that transmission can shift down for you for more acceleration. that vehicle probably came with AT transmission I suspect.
Z looks so good with those stripes and the snow on gloria looked like soap solution detailers use while washing car. 12:10 Yeah, I expected that. You should use your first finger and thumb to unscrew the bolt while keeping your hand on the side, not directly under the bolt. I hope the unexpected surprises ends now. 🤞👍
What I would like you to consider for this Supra and project is the exhaust sound. It is a high pitched dry exhaust sound. I have discussed this with Steve's fellow mechanics and expect a great exhaust sound. Thumbs up👍