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Quite possible a blown fuse. However there is also a blower control module located under the hood near the center of the fire wall. It bolts into the heater box assembly, not to far from the blower motor. You may have to remove the relay/fuse cover assembly to see it. They are known to short out and cause all kinds of problems. Remember though it could also be a simple fuse in that area or under the dash. The worst case here is the whole climate control system in the dash failed.
ECU - Means engine control unit, for cars with manual transmission. PCM is for a car with an automatic transmission an is called Powertrain control unit. Generic is ECU. If you order one from a auto parts store it will have to be programmed to the cars, year, engine and transmission, then any accessories it may have. ACDelco Part # 16183247. Go to O'Reilly's auto parts and look it up.
These sending units are known to fail, a replacement is about $25. I had a Bonneville that did the same thing. The only real way to test it is to remove the electronic sending unit and test it with a manual gauge. In my case I had 40 psi of oil pressure with the manual gauge but the dash would read 5-10psi.
Same thing happened with my 95 park avenue a few weeks ago. I talked to a guy I know who is a GM mechanic and he says that the module (the thing on the dash with all the buttons and the temperature display) is broken and needed to be replaced. These computer modules just get funny with age and eventually have to be replaced. You can find one pretty easy on ebay motors. It's not hard to replace, you just have to take apart the dash and take out the old module and put the new one in. Hope this helps!