Hello
I am using MaxxECU Race.
https://www.maxxecu.com/store/engine-control-or-electronics/plugin-ecu/toyota/toyota-supra-mkiv-2jz-maxxecu-race-plugin-extra
First of all I installed it whit the adapter, using OEM harness. It was very comfortable as no need to make chances to wiring. Only downside was the lack of adding additional equipment - detonation detectors, electrical throttle valve.
Now I have made new harness using maxxecu wiring.
Big plus for me was that I can have every gauge on Mdash, on phone, no need for additional acctual gauges.
https://www.maxxecu.com/mdash
From my setup, the adapter is now obsolete. So I can sell it with aftermarket price.
https://www.maxxecu.com/store/engine-control-or-electronics/plugin-ecu/maxxecu_adapter_harness/maxxecu-plugin-adapter-toyota-supra-mkiv