There was a post fairly recently about switching an idiot light cluster to a gauge cluster. I'm not sure if there was consensus if the pinouts on the plugs changed or not. You'd obviously need an oil pressure sending unit, and a coolant temperature sender instead of the switches on the motor now.
I'd at least lay the clusters side by side and match up the wires to the various gauges/idiot lights to be on the safe side before I went plugging them into the connector and hoping for the best. The cluster connector is going to fit, it's just a matter of whether every wire is in the necessary spot.
