This is driving me crazy. I am not a wiring / electrical guy at all. I did instal my tach and pertronix. For some reason when I turn on my lights my rpm drops by almost 200. Its not wanting to make my truck die. It didnt seem as bad before i swapped the eddy with the holly. Now I finally got the 600cfm Holley totally dial and this is happening. Where do i start? What could it be? Anyone have this problem? All I want to do is drive my truck.