Hey guys I am having a real hard time hooking up this tachometer. I spent about 3 hours but still didn't get it to work. The tachometer came with 4 wires, I hooked all three wires but the forth one is for the coil ignition and I have no idea where that is suppose to go. The three wires that I hooked up were the white one which is for the light, I hooked that to the fuse box. Then I hooked the black wire, which is the ground to the battery (the negative side). The last wire that I hooked was the red one, which is for the ignition switch, I hooked that to the fuse box also. But the forth wire, which is green, is giving me the problem. I tried searching for a diagram but couldn't find it. Can you guys help me out? Any help would be awesome. Thanks