It is easy to do with the need to repin or (not my preferrd method) splice in the donor car's connector being the more technical task. Any good wiring diagram for your year will show where each wire needs to go in the connector. If your Malibu is a factory V8 all you need to do on the engine side is just swap senders. V6 cars would need a few extra steps cause of the choke & oil switch are tied into each other.
Or you can spend some decent money and go with the dakota digital kit. When I finally get around to that I will be swapping my dash to the sweep style since I not longer use the idiot lights. Personally I like the look of the sweep style better when going to the dakota digital gauges
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