What is this?

[domdart]

What is this part for? Do I need it? This part is connected to my coil on my 72 D100. It mounts right on the coil bracket.

 

[burdar]

It cuts down on electrical noise in the radio. I think they call them a radio suppression capacitor.

 

[Murray]

A "condenser". You don't need it, but it don't hurt.