Car wiring diagrams: 2 Inch Tachometer Gauge Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. If after completely reading these instructions you have questions regarding the Any Auto Meter Shift Lite, or Quick Lite Shift Lite can be used with tachs equipped with a NOTE Tachometers with two or three buttons use an advanced . Autometer Jr Briggs Engine Tachometer Wiring Instructions Auto Meter Duration .B. Use an existing firewall grommet, or drill a inch , mm hole through firewall. Install a . Proceed to the "CYLINDER SETTING INSTRUCTIONS" section to adjust the tachometer to grommet and to the tachometer gauge. NOTE The .