The voltmeter on my 98 K1500 jumps back and forth a little when blinker is on. Should I worry?

The voltmeter is usually steady on 14 but drops about 1 mark when the blinker comes on, up when it's off, down when it's on. Perfectly in time with the blinking action. Is there a remedy or is this okay?
Other guages work fine except for the fuel guage always twitching but still works well.
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