Some depends on the ECU and how flexible the programming is (rising or falling edge) and how many teeth it can be used with, usually program selectable. Mine, for instance uses two in a 4 cyl application. Have had another that used the 60-2 configuration. Also, what is your pickup? Some use a magnet to trigger (more common when using a distributor in a V8 deal) and an aluminum wheel (MSD type) but with a Hall sensor you have a larger tooth (mine specs about 5/16 square tooth (tooth count varies with engine and ECU) and similar height, all mild steel. Mine runs to 10200 without missing a beat but is a coil on plug deal, no distributor. Various diameter and tooth counts are available. What does yours want that you can't find?