Jitters
If you are using a Savox low profile servo i will assume its a high torque metal geared digital 1351mg ?
These are a bit power hungry and the ESC supply to the receiver may be a bit underpowered for it, there is one acid test - disconnect the steering servo from the receiver and test your speedo setup again without it connected.
The cure is to add a power capacitor to a spare port on your receiver this normally cures the problem unless you have a dodgy sensor wire.
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