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Remember that all 1JZ engine harnesses are designed for RHD vehicles, so it will be much too short for a LHD Supra. This makes it a painful and difficult process to use a factory 1JZ harness. Go the standalone I say, but don't even think about tuning it yourself - take it to a reputable performance workshop who are experiences with late-model turbo engines. Tuning a sophisticated, high-powered turbo engine is not for the backyard tinkerer.
Don't worry about instruments, that part is easy with or without the factory ECU/harness.
Don't worry about instruments, that part is easy with or without the factory ECU/harness.