CJ Gauge Troubleshooting | In4x4mation Center The fuel and temperature gauges shown below are laid out in a simple left to right configuration. Both Jeep parts gauges have wiring terminals and a large jumper/regulator strap running between them. The fuel gauge terminals are labeled: S, A and I. Fuel gauge S terminal has a pink wire and runs to the fuel Jeep CJ Gauge & Sender Diagnostics - 4x4Wire A reading of 12 volts on the temperature side indicates a bad regulator. 12 volts applied to the temperature gauge's A terminal will cook the gauge. The fuel and temperature gauges can be bench tested by connecting a good ground to the gauge cluster and connecting positive 12v to the I terminal of the fuel gauge using a 3 amp fuse.