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Install an indicator or pointer somewhere on the block to serve as a reference point to the degree wheel. Next, rotate the crank until the No. 1 piston is close to the top of the cylinder. Adjust the degree wheel or the indicator to the zero mark on the wheel. If you’re using a plate-type stop, be sure to place the stop toward the middle of the piston, because the piston may rock in its cylinder, throwing the calibration off slightly.