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If our Crown Victoria had been totally optioned out, we would have had buttons for the height-adjustable pedals and traction control in this piece of trim next to the steering wheel. Even though our car doesn’t have those options, the connectors are still there, giving us a convenient source for 12-volt power for the tach and dashboard illumination (those buttons would normally illuminate with the gauges). We removed each of those wires from the connector and attached them to the tachometer. The gray wire from the adapter connects to the tach’s green wire. We grounded the tach to a nearby ground on the steering column.