Being that it is on a shaft, and I've seen a simular product that does not have multible inputs to self generate the signal in anticipation, I would imagine retarding it past 360 degrees would then put it "ahead". This is a piggy back like many others, that with the right logic when asked to advance, will allow the original pulse to go through (to prevent a MIL) and then also send a pulse so much in retard, its perceived as advanced to the circuit being piggybacked off of.
Any help on the original question, a small custom electronics business? I know its not to be a time machine and advance a signal waiting to yet be seen, but its a task in other ways that has been done.