Buy the best speedo you can afford. Although your looking for something to run a 13.5 motor I would recommend getting an ESC that'll run any motor down to a 5.5T.
The reason for this is once you start racing you will want to go faster. If you limited by your speedo then you'll have to buy a new speedo as well as a motor.
I used speed passions - the GT Pro 2.0 and the LPF 2.0 and find them really good. But some people will say the Orca's, Viper's, or Tekin's are better.
Go to your local track and see what all the top guys are using. They will hopefully be able to advise you what settings to use, and quite often will even set the speedo up for you.
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