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It posts like this that make me wonder how mankind has ever evolved.
You have a SOHC chassis receiving a DOHC engine, correct?
The DOHC dash plug does not plug into the SOHC dash harness, that's probably why they cut it off since it's not needed. Tahe the SOHC harness, cut the dash plug off of it and wire it into the DOHC harness, that's what you'd have to do anyway for the swap, same as an SR, RB, CA, etc. Use the colors as written up in any wiring guide for the above engines. You don't need the rest.
orange- start signal
yellow/green- VSS
yellow/red- tach
blue/black- water temp
blue/green- A/C
black- ground
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