Hi mate
I did put the hobbywing 60 amp in my 12th and it got hot really quick just running around my lounge for a minute so I would say you will need the fan. Mine was the extreme stock speedo though so that may be different.
Hobbywing have just brought out a 1s speedo with a 6 volt output on it too.But I dont know when it is available in the uk.
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