The wire gauge should be similar to the wire on the starter ign. post. They used to sell these pre-made with a push button to engage them. I did a search but could not find one. There will be a spark but nothing dangerous.

EDIT: Here it is.

Last edited by FriedGreenTmater; 11/01/2011 5:54 PM.
1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.