7mge engine harness

[f00g00]

Your injectors look to me to be JDM injectors which are yellow and will not plug into a US harness unless you remove them and gring the tabs from them.
They also flow less than the US ones.
I attatched a pic of one of mine (nevermind it has sand in it) and you can see the color is light green which is a US version injector.
The Alternater is on a different harness than the ECU so don't worry about that. The oil pressure guage also is separate from the ECU. Your guage cluster won't be the same as the Supras so your going to have to either hook up to a separate guage or go mechanical.