I usually do like Cab says. I just ohm it first to make sure its not open or shorted and then I test it with my AC voltmeter. I found most that read between 150 to 900 ohms are usually good and put out a strong enough AC signal. Course make sure the magnet is not missing or part of it broken off. Ron
My car...63 Sport Fury Max Wedge wanna be street car..with new 493 pump gas full exh eng.......10.76 @ 124.49 ! ! ! My page on the cool 62-65 Mopar site ! http://www.1962to1965mopar.ornocar.com/mmo82008.html