Sergio,
I understand from guru Jarrid that the tachs are temperature sensative.  I
had the same experience with my Alpine and asked a year ago.
I know a great shop in Torrence that aligns both my Alpine and Porsche.
They specialize in Porsches.  It's called Johnson Alignment.  I don't have
the number with me.  The first time I went there, I brought my Alpine spec
book for the alignment figures.  The guy later said that he almost threw me
out when I offered him the book (in jest).  He asked me what type of
driving I would do with it - touring, aggressive or racing.  I of course
went with aggressive.  I don't know exactly what he did.  But the results
were an amazing noticable difference.
Jay
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