Like it says, the tach and fuel guage aren't working on my 85 SC. After a 7 year build, this is one of the last issues. I don't know if it was working before I did my work on it or not. I have done the pin change to convert to an 87 logic module, but as many times as I have checked and rechecked that, I don't think I screwed something up there. Is this a common problem that I should look in a certain spot for the cure? Thanks...