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.
Lisle 20580 InLine Spark Tester w/ Coil On Plug Wire
Lisle 20580 InLine Spark Tester w/Coil On Plug Wire, One Size, Factory
Lisle 20580 Inline Spark Tester With Coil On Plug Wire
2PCS Spark Plug Tester, Inline Spark Tester, Ignition Coil Tester Tool for En...
Lisle Tools 20610 - Inline Spark Tester (One Size Factory)
InLine Spark Tester w/Coil On Plug Wire, One Size, Factory
