ca18et to sr20det swat

[Mr. Oldskool]

hello,
I've put a japanese s14 sr20det engine in my european '88 s12 ca18et.
I've tried and I've tried to find the right wireing diagram, but it seems that there are so many different ones..
I can't get the engine wireloom wired up to the car wire harness
So I4m thinking of buying a nistune setup, but still I would have to wire up the engine to the car I guess..?
the engine is pretty much stock, except for the intercooler, blow-of valve and exhaust.
I just want the car to work again..
Hope someone can help me!