I bought this to use for the occasional track days and its also serves as a safe and convenient way to service the car by killing the battery with just a flip of a switch.
Unfortunately, I have two batteries and was told I need two of these and a lot of cable line so I went with a different set up and got a relay instead.
This switch would work fine for cars with only one battery.
I purchased it at evasive motorsports. Here's the link to it: La-Z-Link
I paid $62 total. If interested please make me an offer by text or email. Thanks for looking.
Follow Ups
brand new Sparco battery kill switch - ZroadsTTer01:47:03 11/05/14