Hi guys, I've just bought a pair of Angel Eye rings for a '97 318IS Coupe from Ebay. My question is, does anybody have any experience with installing these and do I need an inverter? And if so, do I need one for each ring? In the description on Ebay it says they are 12v but I wasn't sure if I still needed to buy the inverter. What do I need to wire it to to get them come on when I switch the engine on? Thanks in advance, Mat.