Features 1. 100% brand new and high quality. 2. Easy to install : Wrap black wire around spark plug wire - will work on most engines. 3. Waterproof, durable. 4. 12V working power. 5. No more guessing for the oil change. 6. Show both engine rpm and hours of operation. 7. Read up to 99,999 rpm. 8. Programmable maintenance interval setting. 9. Works on all spark ignition engines by selecting engine type using S1 and S2 buttons. 10. Some engines will require hooking up the white ground wire. 11. This hour meter reads up to 10000 hours and then resets to Zero.
