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No. The Ultimate is not compatible with the RX-8's ignition and injection systems at this time.
Hopefully, Greddy will be addressing this in the near future.
The harness isn't the problem. The EMU is electrically incompatible with the RX-8.
It will be corrected with a dongle for the injectors and a firmware upgreade.
It is NOT available at this time.
I've been working wih Greddy for several months to address this issue.