Generally electrical first. This way you can man-handle it to get it running without worrying about the finish of it. Also, when you are ready to do the cosmetics you may think everything is hunky dory, but when you start tearing stuff apart and really looking close at everything... you may find even more things that need to be addressed (odd hacks, weak components, etc...). So don't be surprised if you are going to need to revisit electrical fixes again anyway.