Tach filter wire?

[GNRick]

Anybody know what this is for? http://www.ebay.com/itm/1978-1988-M...ps=63&clkid=5301029525600070005&_qi=RTM759774

 

[Phoneguy]

GM installed them, its basically a capacitor to clean up the tach signal for cars with HEI Dizzy

Bryan