This is a hot seller to racers, tuners... and most of all, anyone making a custom set of spark plug wires.
A simple tool that can tell you so much.
This unit can be secured to the countertop, or held in a bench vice, then each end of the ignition wire is pushed onto the tester and the ohmmeter will read resistance.
I suggest tugging and twisting the wires while watching the meter to show any signs of increased resistance that have to be investigated further.
I can tell you this has saved us alot of grief over the years.
Avail a couple of ways:
$105.00 Complete with Analog Ohm-meter
Spark Plug Wire Resistance Tester