That kind of mileage and age, you're in for some work... but you seem well aware. Welcome to the forum!
There aren't many options if you're looking to keep the TEMS system. If not then there are a lot of options out there. There's been a lot of discussion on this in the past and if you do a search you should find a lot.
Good luck with the Supra!
Oh, and a grey interior??? WOW, I don't think I've ever seen a maroon MKIII that didn't have a maroon interior. I thoroughly dislike red and blue interiors.
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