Connect the tool between the spark plug and the plug wire. With the engine running, the tool flashes a mirror image of the ignition spark. Connect the tool between the spark plug and the plug wire.
Lisle 20610 Inline Spark Tester
Lisle Tools 20610 - Inline Spark Tester (One Size Factory)
Lisle 20580 InLine Spark Tester w/ Coil On Plug Wire
InLine Spark Tester w/Coil On Plug Wire, One Size, Factory
Lisle InLine Spark Tester w/ Coil-On-Plug Wire
