Theme switcher only for Admin?

I’m trying to wrap the Theme switcher plugin so that only the admin can see it. That way I can work on a backup theme while my site’s regular viewers see the regular theme I have set as default. However, I don’t seem to have the PHP code right. Can anyone help?

Here is what I have:

<?php global $user_level; if ($user_level > 8) { ?>
<ul>
<h2>Theme Switcher</h2>
<li>
<?php get_theme_switcher() ?>
</li>
</ul>
<?php } ?>

If I remove the PHP code the theme switcher shows up just fine. With the PHP code I never see anything. I even tried adding an “echo $user_level;” command, but that didn’t do anything either. What am I missing?