Miata ecu power
 

I have a Miata drivetrain in my Datsun 240z and have a question. So the engine has the harness for the engine but the ecu is not getting power from anything. I also have a fuse box for the engine bay do i connect the fuse box from the harness to the fuse box directly or is there a way I can bypass the fuse box and directly wire stuff into the ecu and power it.