Acura Temp Gauge reads lower after Timing Belt service

My 2008 Acura TL Base Auto has been well maintained, and at 90K miles, I had dealer perform timing belt service including tensioner replacement. Ever since then, the temperature gauge has been reading at about 1/4 level, which is couple of notches below what it used to be all its life prior (used to be at about 1/3 level). I believe there’s certain temperature spec for the engine to run optimally and at high efficiency. So I’m wondering if I should be worried that the engine is running too cool now.

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