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For the fuel level, the gauge is reading that the float has failed or is unplugged. reconnect it at the tank and that should stop blinking.
For the speed, there is a small hole on the leading edge of the gear case, this is where the pressure to activate the speed come in from. As you are boating, and debris that you may have run over would find its way into this hole and plug it up. To clear it, take a small drill bit and some locking pliers. Use the bit to clear the debris from the hole. Then used compressed air to check your work on it.