OK it could be the ESC just needs to be set up correctly. Best way i find is to switch the ESC on & hold down the set-up button, then plug in the battery, rather than trying to set it up by switching on & trying to press the button when the red & green lights are flashing.
Plus check the switch, the speedo in the RTR brushed Ansmanns tend to be rebadged Mtroniks units which have p!$$ poor switches & the wire to the switch is really flimsy & tends to break or come away from the switch.
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