It's possible that the two issues are unrelated. The tapping sound is slightly normal... When I hear mine tapping I change the oil and it goes away. The high temp guage would have me more worried.
Search this site on temperature
Good luck,
-Steve
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2001 Boxster S
Desnorkled
Pioneer Avic D3
JL Audio 6.5 inch subs (in the door)
Pyramid 4 channel amp
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