i am going to wire up a new tach because old one isnt working i went behind the tach and check if i was getting power to the wire blue/orange. no power so instead of looking for were the signal got lost im just going to wire up a new one i need to know were to plug it into the ecu. i think they come with 4 wires if some could tell me were each one goes and/or show me a wire diagram that would be great thanks for the help.