I bought a pair of auto meter ultra lite boost gauge and a/f gauge and a pillar preparing for future mods that include a 4 or 6lb lower and full bassani exhaust. anyway I got the boost gauge to work but i need help with the light. I'm not electronically inclined i know black is ground and white goes to 12v source such as the lighting. I dont know where to connect the thite cable on both gauges. i cant find a power source and dont know where to connect it to. On the A/F gauge I read the directions and they are preety much self explanatory but again the white cable that goes to the power source and the purple cable that goes to the pcm signal wire (oxygen sensor) I cant find tham. I'm lost please help.