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Sounds like you probably have a loose connection on your speedo wire. Re-check your wiring connections between the MPGuino and your speedo wire.
Not owning a JayCar module, I can't say what the fuel signal problem is. However, your MPGuino is not receiving the fuel injection signal. This is why your gal/hr figure always stays at zero, and why your MPG figure is zero when stopped and dashes when you're moving.
Is this JayCar module a kit that you have to put together? Or is it pre-assembled?
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