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You won't get the accuracy required without a dial gauge. The movement of the piston a few degrees either side of TDC is extremely small, and you need to establish exactly where TDC is.
Cylinder #1 is usually, with the odd exception, the cylinder nearest the crank pulley, but, as you say, the one the other end is usually its twin.
Cylinder #1 is usually, with the odd exception, the cylinder nearest the crank pulley, but, as you say, the one the other end is usually its twin.