95 into 89 swap
 

Hey guys I have a question, I am doing a dohc swap from a 95 into an 89. Is it possible to use 89 sohc wiring harness with this motor?

Here's exactly everything you need to know...and yes, you'll need the different harness

KA24e to KA24de swap - Step-by-step. : 240sx Articles

I currently have a 93 dohc harness and my mechanic says it doesnt mount right

Yes, because its different, you need a 95+ dohc engine harness...

but my engine is an OBD I not II

ok sorry, the 93 harness is what you want.

from what it sounds like you need the plug from the body harness of a dohc

heres what you need to do(this is pulled from the nicoclub writeup i posted)


Wiring:
1. Locate the body harness (under dash harness that attached to the ECU) that attached to your old harness. Cut the old connector off (the one that attached to your SOHC harness) and attach your DOHC body harness connector. Just match the colors!
Yellow/Red --Tach
Yellow/Green--Speedometor
Orange--Ignition start
Black---Ground
Blue/Black---Water temp sensor

There will be some wires left over. These are for the SOHC's diagnostic plug, and are unnecessary. Please note: Your car will NOT be able to hook up to a CONSULT tool.
2. Use a soldering iron to splice the wires together. It makes for a much cleaner job, and a cleaner electrical signal.
3. You need to swap out your tach if you want one that works. No wiring is involved, but it must be done. Simply pull your gauge cluster and remove the three screws behind the tach. Lift and separate. Replace.