Right I'm working on one. My friend totaled is out and sold me the motor and trans. with the engine harness still there and ecm, rear end and gas tank. I have contact one of the members that gave me some info on doing the swap. So here it is.
you're building a clone , you need all the harnesses not just the engine harness
thats engine harness (including battery cable and injector harness), dash harness , body harness on driverside , tail lamp harness , fuel tank sender and a pump, and fuel tank
youll also need to make sure you have a 3/8 fuel line and a return fuel line on the chassis , the turbo cars had a filter on the frame rail that NA cars wouldnt have and the fuel and return line would have the saginaw ends to connect to the engine fuel lines
you dont really need the harness to make a cluster work but you would be on you own to wire the tach /boost and theres other wires youll need to run to power relays , fuel pump, ign module, injectors ,etc thats not supported by the NA dash harness
also youd be on your own to run power and the conenctions to the fuel pump
make it easy and get a turbo dash harness and body harness , or call caspers electronics and he can build you a hybrid harness
