If you want to do-it-yourself connecting tachometer adapter to your Mitsubishi Eclipse, it is recommended to clearly identify the Coil Positive (12V) supply. The following figure show you the wiring schematic of your car’s ignition system for identifying supply wiring purposes.
Once the wire has been located it is recommended to check for 12 volts using a volt meter. Connect the meter and turn the ignition On. See complete installation guide of DIY Tach Adapter for Mitsubishi Eclipse (and Eagle Talon) here (source: autometer.com)
