I recently had mine off, and noticed the gasket that was in there was missing 2 chunks. Probably from the last guy that re-used it(dealer... ). Luckily, there was enough soot and oil residue that it seemed to be sealed OK. Since the auto stores where closed at such a late hour, I had to make do. Copper RTV worked just fine in this case.
Unless it comes off all in one piece and looks like new, I wouldn't re-use it. A couple $ for a new gasket or some RTV isn't likely to destroy your budget.
If it comes off in one piece and looks ok you can reuse it. I usually get about 5-6 removals on mine before it needs replaced. Great choice on ultralites, I have boost, trans temp, and EGT in that style on pillar and really like the look.:thumb:
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