Jumpy tach?

[Vaughanabe13]

So I've noticed this in my Z and it's a little weird. Under hard acceleration I will sometimes notice the tach needle getting kind of erratic and jumpy. Like it will be increasing and then for a split second it will "stick" and then it will jump up after it gets "unstuck" and it just generally isn't a smooth movement of the needle. When the car starts up the needles all do their sweeps just fine with no jumpy/jerky movements. Anyone else notice this? Am I making something out of nothing here or is this actually a thing.