We are not sure what you are saying "Ignition pulsator ring" is it for the ignition system or the ignition key? Here is the crankshaft angle sensor location and replacement instructions in case this is what you meant. Check out the images (below).
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.