Alright mace,
I dont think you get a massive amount of heat transfer from the motor so if ur speedo is overheating I would suggest its either down to the motor you are running or the gearing you are running!
What turn motor have you got in and what pinion size are you currently running?
I know you had some issues with ur speedo when we last raced indoors (certainly smelt like you had issues) so maybe ur speedo is knackered!
I've run my Nosram Pearl Evolution speedo on the plate with my 6.5 turn speed passion using a 21 tooth pinion and my speedo didn't get very hot at all! far from overheating!
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