00Z28Cammy

hey everyone... I'm not sure I'm in the right space but I need advise on something. My tach lights keep flashing for some reason. whenever I push on the gas it flickers a lot and then it settles down. at other times coming off a stop light it flickers and then stops again. I'm not sure what';s going on because my battery gauge is fine, and I bought the car like 4 months ago.. I'm hoping it's not the alternator, but after a couple starts it seems that it's ok.. just the tachometer lights flicker... someone help