DB ,let see if I can explain it . It's in the electricial circuit when the rpm's coming from the coil get to high the circuit kick's in an enterupts the electrial charge. thus shuting down the coil . You will know when you hit it because it feels likes when you start running out of gas. It also make's it feel like an electricial short. Go out an run the bike up in any gear until you feel it. It won't hurt the bike,that's what it's there for. (to replace a tach on the cruiser's) all the later model bikes (cruiser's anyway) have them.
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