I have an early 1976 FJ40. I am replacing the odometer and trying to fix a jumpy speedometer. I ordered a long speedo cable and when I went to put it in, I find this generator thing on the firewall. I can't find any documentation on what the generator does (except a picture on SOR), whether its important, or why I can't just bypass it. I have seen a few postings on the subject but nothing that addresses the purpose of the generator. Anyone kopw about this, and whethe its OK to just bypass it with a long cable?