The speedometer is cable driven, it doesn't matter which gauge you use.
The tachometer is different between the non-turbo (7M-GE) and the turbo (7M-GTE). You can either swap out some resistors on the control board in the cluster or you may swap the whole tach mechanism... if you have another cluster, just swap it; Otherwise let me know and I'll dig up the details on what you need to change in the circuit... if you can solder it's not too difficult.
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