I just finished my tach and gauge install. The only problem I have is that the back lighting and turn signals don't work now. How does the wiring schematic thing on the back of the gauge cluster work? Is it a positive and negative thing or is everything linked together? When I installed the tach I had to remove 2 of the bulbs/retainers. I figure that is why it isn't wanting to work properly. I am thinking about making my own wiring harness to operate the turn signals and back lighting. Has anyone done this and spliced into the factory harness? You can look in the interior section of my web site to see what I am talking about. Suggestions???????