That solved that problem, thought all the cables were the same. Very small bump under the heatshrink so obviously they have added some components. Thanks for your help solving that problem.
Just the last problem to solve now, I get throttle when moving the steering. I checked with Futaba UK and they calculated my 9550 servo draws about 1.5A when on stall, well within the 2A the speedo can supply. Need to try adding capacitors to Rx and power wires, plus insulating the speedo from chassis better. The problem doesn't happen a lot, but will happen a few times in a race, also happens when car is held off the ground.
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