Okay, I'm installing the small accessery tach today...I thought that the red/white wire was the one that I plugged into the tach for the signal, but the one that was sent to me had a Blue/Red found under the instrument cluster wire in the box. I see both of these wires coming from the coil. Which one plugs into the tach? Also, the thick wire that goes to the G, is it also tucked in the back. I already found the lighting source.

Thank you so much.