Setting timing by ear gets you close and no closer. A timing light shows you exactly where the spark is relative to the piston, and a single-wire inductive pickup means you clamp it on one plug lead and go rather than wiring into a battery. This one also works as a flashlight, which matters more than it sounds like at eleven at night in a dark garage.

Proform 67419 1-Wire LED Timing Light and Flashlight Features:

• Works on 2, 4, 6 and 8 cylinder engines.
• Single wire inductive pickup, no battery leads to connect.
• Checks ignition timing against the crankshaft mark.
• Shows electronic advance and retard so a curve can be verified.
• Helps diagnose a no-spark condition.
• LED design doubles as a work flashlight.
• Sold individually.