How do you hook up stock tachometer on 1990 mitsubishi eclipse gsx?

To hook up a stock tachometer on a 1990 Mitsubishi Eclipse GSX, locate the wiring harness behind the dashboard. Connect the tachometer's signal wire to the ignition coil's positive terminal or the ECU's tach signal wire, typically found in the engine bay or near the fuse box. Make sure to connect the power and ground wires appropriately. Finally, secure all connections and test the tachometer to ensure it's functioning properly.