They do have a thermal cut out which is 95 degrees on the pro version with mod 2 software (can't speak for the others). Whether you have this enabled would depend on your settings.
Just be careful going mad with your DMTS 3.0 (timing advance) settings. I copied a team driver set up for the speedo, but ran it with an LRP X12 (which run higher advance than an SP for example) and it was getting red hot. Eventually the capacitor let go which made me realise I had it set up incorrectly.
How hot were the speedo/motor when you experienced the smell?
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