Sounds like you've blown a phase! It's a bit worrying if you've done 2 the same way when others aren't reporting a problem. Did you use the same motor? It may have been damaged with the first speedo and then it damaged the 2nd.
If you want to check the speedo, search for some of my posts in the electrics section and I've provided tips on how to test for blown short FETs using a DVM.
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