Could a bad tachometer make a Model A hard to start?

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With all this missing around, did you consider checking the Battery? Does not matter if new or not, still could be bad. If battery load test good, then check all the grounds. Set the points at .020-.021. If the car is still positive ground, are you connecting the leads to the correct terminals? How many volts are you getting to the points cold, if 6 volts, that is what the cold reading should be.