You'll need to consult your owner's manual. This is the best source for finding the fuse location and rating. The fuse box is usually located under the hood or in the interior.
If you don't have the owner's manual, a quick online search for "1988 Corvette fuse box diagram" should provide you with a diagram showing the fuse locations. Be cautious when working with the fuse box and always disconnect the negative battery terminal before working on electrical components.