As mentioned above Spektrum and Savox don't really seem to mix well, from my understanding it's caused by the Savox servo drawing higher currents than other servos and the Spektrum receivers having the failsafe voltage cut off set higher than Futaba or Sanwa. The RS Pro's weren't know to having the strongest BEC's either! I had the same issues with an 1/8th electric buggy then I switched to Futaba servos and Sanwa radio and never had an issue again.
For the Tekin speedo it does need a capacitor on it, Tekin mount it directly on the speedo as the shorter the wiring the better the effect it has, many people also mounted two caps on the RS Pro for 4wd trying to keep the speedo cooler.
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