72 demon 340 common under dash wiring issue for no start, no power

The MAD wiring upgrade eliminates the issue of bulkhead connector issues for the main power circuit going though the bulkhead connector. Also I would recommend bypassing amp meter and install volt meter in its place( I think a gauge can be found for $25 ). Many great articles on it in here. I converted my amp gauge to volt gauge on ralleye dash, but there are also how to's for standard style dash.