Adds the ability to check engine rpm; works with any gas engine up to two cylinders at speeds up to 8000 rpm. Firing pattern: 1 spark = 1 rpm; resolution in 10-rpm increments.

• Hour meter keeps track of important maintenance times for oil changes, valve adjustments, spark plugs and more
• Usable with any gas engine
• Records and displays up to 9,999.9 hours; hours automatically roll over
• Includes log book to note oil changes, service intervals, etc.
• Peel and stick or attach with supplied hardware
• Connects to spark plug wire, so no batteries are needed
• Safely and completely encased in 100% epoxy
• Hour/tach meter adds the ability to check engine rpm; works with any gas engine up to two cylinders at speeds up to 20,000 rpm
• Firing pattern: 1 spark = 1 rpm; resolution in 10 rpm increments
• Made in the USA