Need help asap with 4ac to 4age!!!!!!!

[Rascal21]

What Fax said, you can make do with what you already got.
Wire it all up as you start to understand what goes where, it`s been a painstaking 3 week process for me too because I had a self-sufficient wiring loom which WOULD have worked if I had had the firewall engine harness connector on the dash loom, so you`re already way better off than me!

I cant say much more than I recently learned..

As already mentioned you need the 12v ECU power from ignition key junction (For the Injectors, coil& igniter and so forth), mine is connected to Black-Yellow (I think) @ Ignition.
In your case you save a lot of time by connecting the engine harness sensor wires, 12v switch and all that stuff to your SR5 dash harness firewall connector

ECU earth on engine head/intake (I bolted mine to intake) and remember good earth from firewall to engine head, and good earth from chassis to engine block!
What put my patience on test was ECU-ground

Just use your current alternator and wiring, this way it goes from alternator, through fender and into footwell junction box, across the dash loom and into battery +terminal!

This means your ECU harness fuse/relay box (If you have one) has to be connected to battery +terminal for powering Fuel Pump and so forth.
I`m not sure what fuel pump the SR5 uses, but if you can use that to fill a catch tank and a Walbro/Bosch from there to the engine that`d be good for the engine.