I ran across this getting connectors for my Corvette and thought it rather unique, not to mention....well, just a little lazy when it comes to using a multi-meter. But it also makes a quick reference when an issue arises and you don't have that multi-meter.

For those who's Jag is fickle when it comes to its electronics and the battery is the main culprit of issues when its not up to par, I thought it worth posting. Not to mention if you either just have to have that niche' thing no one else has or can't figure out what to get your gear head as a gift.

http://www.wiringproducts.com/4-port...-terminal.html
http://www.wiringproducts.com/4-port...-negative.html

From what I can gather from the lone pic, it appears its an allen wrench lug to clamp the wires down.