The cluster has nothing to do with things like the wipers, turn signals (besides the indicators, which you'll just wire in from the CRX's cluster harness) etc.
The CRX's speedo is cable driven, and I suspect the G10 trans also has a cable drive... you might need to source someone to make a cable with the CRX's head end and the G10's driven end, or see if you can make the Metro's speedo cable fit on the CRXs' head.
Chances are, it's going to be easier to just leave the CRX gauge cluster in there - except - making the tach work will require a "healer" of some sort, because the tach is meant for a 4 cylinder, not a 3. It gets it's signal from the igniter in the dizzy - I believe the green wire - so you might have to figure out about using a resistor or something to keep it accurate, but I'm not sure about that. It might "just work".
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