All sierra's have a stand alone engine loom, they are connected to the body loom via 3 connectors. the DOHC usualy conforms to the post 90 wiring. the best bet it so remove the engine loom and salvage the plugs that it plugs into.
More details of the plugs ( not totaly complete ) can be found on my website, although it's aimed at people converting to the 24V v6.
TT
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