The factory tach isn't very stout. Do a search and you'll see lots of posts about broken ones, and how inaccurate they are. Get an aftermarket one if you want.
Mine nosedives now and then, sticks at 2500, bounces back when I go into OD, it does everything except spit pea soup.
As long as the engine doesn't feel or sound like it's revving 4k all the time, I wouldn't worry about it
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