on second thought, i should have thought about it more. the engine hits TDC for each cylinder twice per complete revolution of the crankshaft once for the ignition of its air/fuel mixture, and once before it lets the spent gases out (while the other cylinder is igniting). whichever of the 2|T's it is on doesn't matter. just don't take out the sensor at 2|T and put it back in at 1|T!
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