Bathy,
I think you're right, but the supplied one is both quiet and in most applications up to the job. In my 2wd, it has virtually no air flow supplied to it but the speedo never gets anything more than warm. In my 4wd I have to run a 25mm fan due to the restrictions of the current bodyshell. As a precaution I have 7.2v'd the fan and this also is more than up to cooling the speedo enough.
Dan
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