[Red to black]

Just an addition to my previous post really.
There is another way to the polarity sense with a DC motor that could also be used with AC motors, is to arrange an auxiliary switch linked/ganged to each direction change switch/logic to tell the counter whether to increment or decrement if this function on the counter is available.
Of course the pulse/rotation sensor is still required in either case to count the number of turns.
It will be interesting to see what you do with this in any event, I know this is only a means to an end for you personally but it could provide useful information for others, have fun.