depends on your use of the speedo,
LRP do have a brushless cooling kit which is a reciever plug'able' 25x25mm fan and a power cap.
Touring car using the 4-start motor I think you would need the fan,
off-road I am guessing just the heatsink, but if its a mega high grip track the fan wont do any harm.
12th scale on 4 cells you don't need the fan or even the heatsink from what I am told.
I was doing some 'street running' with my 2WD last night, sphere comp, 4-star motor, no heatsink or fan (not recomended, but I just installed it) and I ran for 10 minutes, the speedo was hot after the run but nothing I was concerned about.
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