Hey, it's a good idea to keep the plastic cover off for a week or two to make sure the needles are where they are supposed to be. I made this mistake, and my gas needle was off <img src=/images/forums/snitz/eek.gif width=15 height=15 border=0>
But, yeah, it's pretty simple stuff for the Elantra.
Oh, also, be sure to disconnect your neg battery terminal to cut power to your dash, or else, when you disconnect those wires, you could end up causing the CEL to get stuck on... that's a costly mistake (monitary value that is) because you usually have to pay your dealership to reset it...
Good luck with your gauges! Let us know how it goes!
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