Sounds like one of the sets of windings is burning out, or is shorting slightly. Take/Send it back IMO.
Otherwise check that the wires match up correctly from the speedo to the tabs. If it sounds quite noisy, then you may have some of the wires matched up incorrectly, which means that the rotor is not turning properly (if you see what I mean). It would also explain the motor getting hot!
Check this first!
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