Car wiring diagrams: Autometer Tacho Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Manufacture gauges, gauge pods and test equipment..V bA TTERY INSTALLATION INSTRUCTIONS " Tachometer Rev. B QUESTIONS If after completely reading these instructions you have questions . Video embedded No spark plugs? No problem. The Auto Meter sel tachs will work out of the box with yoursel engine. Using a small inductive .