wat setups have you guys used to swap a 4v into your mustangs, wat did u do for ur wiring such as FAST, painless, goin to a junk yard for the original harness. please help need to know my options

the motor is a 2003 mach 1 brand new with engine harness, i need a harness from the computer out.

 

the stock computer is fine

 

i put a 03 mach1 into a 97 gt the main harness conectors dont fit the ones on the engine harness the sensors are tiny bit different