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The red/yellow wire is for the OD indicator light - the connector is at the lower right side of the cluster, under the fuel gauge/temp gauge side.
The orange wire is the cruise control speedometer signal carrier, and connects to the U-shaped spade connector - what you refer to as "2 brass looking plugs." As I recall, it is a continuous connector, so I'm not sure it makes a difference where you hook up the orange wire.
As you noted, the red/white is the for the tach, and hooking it anywhere on the cluster will result in some unpleasantness.
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