Replaces any contact points ignition. Upgrades existing factory-installed electronic ignition. Breakerless ignition keeps engine always in tune and engine at peak efficiency for better gas mileage. Ensures faster, easier starts in all temperature extremes (operating temperature is -65 f to +350 f). Improves power for smoother running. Ends points problems forever, saving on replacement costs. No more timing adjustments just set timing once and forget it for the life of your vehicle 's engine. Timing is accurate to within an incredible 1/10 of a degree. Solid-state power module ensures consistent, high firing (up to 7,000 rpm) to dramatically increase spark plug life. Dwell is preset at factory for installation only 4 wires to hook up. Carb eo #d-47-2, 3 and d-225-11. Hardware and instructions included.