I was adjusting the rack & pinion adjustement, and when I got done both the horn and tach had quit working. Thinking that I must have tugged on some wire by mistake, I went back and looked for the loose or hanging culprit. But all I found were vaccume lines. Checked the fuse box and all the fuses looked intact, but I gave them all a good twist just in case. I've read all about the cigarette butt trick, but haven't tried it as I just wasn't sure. Why would the tach amp affect the horn? Is there a common ground for both the tach and horn?

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'83 300D (220000 miles and counting)