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If it is OEM Tach it may be metal debris on the magnet. The needle sweeps close to the magnet and metal shavings prevent it from moving as it should. I used a fork and removed the needle and disassembled and cleaned mine and problem hasn't reoccured (this was approx 6 years ago)
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68 Short Stepside, 350, quadrajet, 700r4, 3:73 posi, power front discs, HEI, Factory Air, Tilt, Tach, accelerator cable instead of rod, sway bar.
96 Impala SS
97 Monte Carlo
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