OK a bit more. I really must learn to read properly first time...
The thermal cut out temp isn't read from the outside of the speedo (heatsink) its from inside via a component on the circuit board, but also sometimes inside the FET substrate. This is why it might seem hot.
oh, you mention that the speedo is warm, not hot, but the motor is hot. how are you reading the motor temp at point of cut out?
Where are you reading the cut-out temp from, plugging the progbox in after its shutdown?
by the way, what's the motor?
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