Hey everyone! Im new to the forum! I do have a question about installing an aftermarket tach. Its mounted and wires ran, but im not getting signal. I was told to go through the coil packs. Well... i tried every wire. I read not the blue and white, or the black, but the other which is red and white(on my truck) I tried all three of those and also through the cluster was a Blue, and a grey. I tried those too.. and still nothing... any help would be so awesome! Thanks group!!!!!!