Looking into buyin a 88 TII that has had a 91 S5 swap into it...only thing is it needs a crank angle sensor and an S5 harness.

Question: How difficult would it be to get an S5 harness? Splicing the body harness from the S4 to the S5, i remember reading lots of threads on this but after searching can't find much. How difficult would this be? Is this way too much to take on? i'm always scared to take on someone elses project but its a hell of a deal for a TII and i need to get my rotary fix! Any info or links appreciated!