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In my experience with an '89 cutlass supreme with a digital dash cluster, I have seldom seen such unreliable junk from gm. I don't think it's a simple swap, or I sure would have tried it, lol, my memory of it fades...thankfully ! I do remember recoiling in all haste to exit when the dealership told me what it would cost to send my cluster off for repair. I got by with a salvage one, that also worked only sporadically. You'd be much better off spending money on maintenance and repair, leave the digital dash in the dust.
On a OBD I car the connector is under the hood on the drivers side near the strut tower. It will be in a plastic cap marked EEC-TEST and have two connectors one with a rectangular shape that has a sort of pointed side and 4-6 wires in it and then a single wire with a gray plastic end on it.