Go to maplins mate.To give you an idea i use a 16v 4700uf cap on my speedo as it helps stop the spikeing when you plug the lipos in.the novak powercaps are rated a 16v 2700uf.If you have the spec sheet of the speedo take that to maplins,there should be a boffin there who could be more specific with the uf rating you would be best using.
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