It'* mainly a safty thing, you know, I seem to recall that the new aerforce gauges have a CASE learn built in.

Yeah new aero forces will do the job... i did the case on mine with a 5000 dollar snap on obd II thing lol iirc i didnt do a case on my first flashed pcm and its cause the pcm you bought is close to the original one you bought. Like it came from a bonny of your year.... so it will still run without a case, but if you get a monte carlo pcm with bonneville things in it it will need to get cased so your car can relearn it