I think he wants to make a digital rpm meter for a motor-cycle.
Usama, if you want usable answers, then it helps to give more and clear information and skip the use of abriviations.Now we have to guess what you want.
May be. I had considered this meaning if a motorcycle had a "rotor". Of course it has many rotating parts, e.g. wheels or a crank shaft, but not particularly a "rotor".
It can be a language thing, something that rotates is a rotor and maybe he does not know the right name. (rotor is shorter as crankshaftflywheel, and he seems to like short words. ;-)
But serious, my 54' Triumph speedtwin has a rotor in the ignition,
But we will hopefully hear what he wants to build.