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Electronic analogue speedos and tachos often can be seen to jump up a bit at switch on - they would usually be resting on the lower needle stop and then jump to zero when the ignition is switched on.
My Mercedes speedo jumped up above zero and I just took it out of the dashboard and removed the pointer and refitted it at zero. My satnav verified the speedo as being acceptably accurate...
The old fashioned cable driven speedos often didn't begin to register until 5 mph.
If it is a digital speedo you will need to approach the dealer about calibration.
Get a voltmeter, place the positive lead on the lug off of the alternator, or on the pos. battery terminal when running. ground to chassis or body. ALTERNATOR VOLTAGE: 13.5 or higher at 1500RPM is minimum
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