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You've seen crank triggers before, but do you know they're vital for ignition timing accuracy and stability? The 8-inch aluminum wheel houses four magnets that trigger the ignition as the engine rotates and passes the stationary nonmagnetic pick-up. This eliminates any false readings and ensures your timing is where you want it, which was especially crucial in our case whenever the nitrous was engaged. Two degrees can be the difference between a good run or a burnt piston.