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umm hes very wrong u do need the dash harness for the car to start.
the SOHC and DOHC body harness connectors are the EXACT same but the wires are not in the same places on the harness connetors so the color wires you need to connect together will not meet up at the same pin hole.
in reality you dont need to use the connectors, you can just cut off the body harness connectors on the DOHC harness and the SOHC under dash harness and connect the wires together but using teh connectors makes for a much easier and cleaner install.
the wire colors you need to connect are these 5:
Yellow/red --Tach
Yellow/Green--speedo
orange--ignition start
black---ground
blue/black---water temp sensor.
how i connected these was like this:
i wrote down where the 5 wires were located in the SOHC body harness connector by assigning each pin hole on the top row a number and each on the bottom a letter of the alphabet. i wish i saved the paper i wrote them down on. sorry
i next removed the sohc body connecter (white plastic clip) and dohc body harness connector (brown plastic clip) from their engine harnesses.
i reinstalled the SOHC connector onto the DOHC engine harness using only the 5 wires needed and placing them back into the correct positions based on the information i wrote down before i pulled them out.
i used electrical tape to cover all the exposed pins that i didnt need and then taped the whole bundle of wires together for a very need install!
this was taken from a writeup pn 240sxforums by twofortysx
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