The pointer of the fuel gauge is moved by the magnetic fields of 2 coils. The coils are at right angles to each other. Voltage is available from the GAUGES fuse through CKT 39 (PNK) when the ignition switch is in RUN or START position. Voltage is applied to the E-coil and the circuit divides at the opposite end of the coil. One path continues to ground G108 through the F-coil on CKT 451 (BLK/WHT). The other path, through CKT 30 (PPL), travels to the variable resistor of the fuel level sensor on diesel engines or the vehicle control module (VCM) on gasoline engines. The VCM is connected the fuel pump module. When the level in the fuel tank is low, the resistance to ground in the fuel level sensor is low. More of the current then flows directly through the E-coil. This condition pulls the pointer toward E on the fuel gauge. When the fuel tank is full, the resistance to ground in the fuel level sensor is high. More current then flows through both the F-coil. The pointer moves toward F on the fuel gauge.

The oil pressure gauge displays the engine oil pressure. The pointer of the gauge operates in a manner similar to the fuel gauge. When the oil pressure is low, the engine oil pressure sensor has low resistance to ground. When the oil pressure is high, the engine oil pressure sensor has high resistance to ground. Voltage is available to the oil pressure gauge from the GAUGES fuse through CKT 39 (PNK). The oil pressure gauge connects to the engine oil pressure sensor through CKT 31 (TAN). The E-coil is grounded at G108 through CKT 451 (BLK/WHT).

The temperature gauge displays the engine coolant temperature. The pointer of the gauge operates in a manner similar to the fuel gauge. At high temperatures, the engine coolant temperature sensor has low resistance. At low temperatures, the engine coolant temperature sensor has high resistance. Voltage is available to the temperature gauge from the GAUGES fuse through CKT 39 (PNK). The temperature gauge connects to the engine coolant temperature sensor through CKT 35 (DK GRN). The E-coil is grounded at G108 through CKT 451 (BLK/WHT).

The voltmeter displays the electrical system's voltage when the ignition switch is in the RUN or START position. Voltage is available to the voltmeter from the GAUGES fuse through CKT 39 (PNK). The other side of the voltmeter connects to ground G108 through CKT 451 (BLK/WHT). As the voltage decreases, the pointer moves toward 0. As the voltage increases, the pointer moves toward 18 volts.

The vehicle speed sensor (VSS) circuit produces voltage pulses. The frequency of the pulses is proportional to the vehicle speed. In diesel vehicles, the VSS calibrator produces and processes this signal. In gasoline vehicles, the VCM produces and processes this signal.

The tachometer displays the engine speed in revolutions per minute (RPM). Signals are received by the tachometer on CKT 121 (WHT). On diesel engines, the signal is produced by the generator. On gasoline engines, the signal is produced by the VCM.

The GLOW PLUGS indicator alerts the driver not to start the engine until the glow plugs have reached operating temperature. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The powertrain control module (PCM) supplies the ground at the glow plug indicator switch. When the glow plugs reach operating temperature, the PCM opens the contacts of this switch and the GLOW PLUGS indicator turns off.

The SERVICE THROTTLE SOON indicator alerts the driver that there is a problem with the throttle. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The powertrain control module (PCM) supplies the ground at the SERVICE THROTTLE SOON indicator control switch. When the PCM detects a problem with the throttle, the contacts at this switch close and the the SERVICE THROTTLE SOON indicator illuminates.

The low coolant level indicator warns the driver when the coolant level is too low. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The low coolant indicator connects to the engine coolant level switch through CKT 68 (YEL/BLK). The engine coolant level switch has ground at all times to G200 through CKT 250 (BLK). The engine coolant level switch closes when the coolant level falls below a certain level and the indicator illuminates.

The WATER IN FUEL indicator warns the driver when the fuel tank has too much water mixed into the fuel. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The WATER IN FUEL indicator connects to the water in fuel indicator sensor through CKT 508 (YEL/BLK). When the ignition switch is in the RUN or START position, voltage is available from the ECM-1 fuse to the water in fuel indicator sensor through CKT 439 (PNK). The water in fuel indicator sensor has permanent ground at G104 through CKT 150 (BLK). When the water in fuel indicator sensor senses too much fuel in the fuel tank, the sensor switch closes to ground (case) and the indicator illuminates.

The MIL warns the driver of a condition with the engine. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The powertrain control module (PCM) in diesel vehicles or the vehicle control module (VCM) in gasoline vehicles provides ground to the indicator through CKT 419 (BRN/WHT). When the PCM/VCM provides ground, the indicator illuminates.

The TRANS indicator alerts the driver that there is a problem with the transmission. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The transmission control module (TCM) provides ground to the indicator through CKT 1234 (GRY) at the service transmission output switch. When the TCM detects a problem with the transmission, the switch closes to ground and the indicator illuminates.

The DOOR AJAR indicator alerts the driver that one or more doors are not closed. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The door ajar switch needed to complete the circuit is installed by the body builder and connected to the indicator by CKT 745 (GRY/BLK).

The ABS indicator warns the driver that there is a problem with the anti-lock brake system. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The electronic brake control module (EBCM) provides ground to the indicator through CKT 867 (LT GRN) at the ABS indicator lamp control. When the EBCM detects a problem with the anti-lock brake system, the switch closes and the indicator illuminates.

The DRL indicator alerts the driver that the daytime running lights (DRL) are on. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). The DRL module provides ground to the indicator through CKT 592 (LT GRN/BLK) at the DRL relay control switch. This switch is normally in the closed position. With the headlamps switch in the park or headlamp position, the DRL module opens the contacts at this switch and the indicator goes off.

The BRAKE indicator warns the driver that there is a problem with the hydraulic brake system or that the parking brake has been applied. Voltage is supplied to the indicator from the GAUGES fuse when the ignition switch in the RUN or START position through CKT 39 (PNK). Problems with the brake system are detected by the EBCM which supplies ground to the indicator through CKT 33 (TAN/WHT) and CKT 680 (PPL). The indicator supplies voltage to the park brake through CKT 33 (TAN/WHT). The park brake switch is grounded at G 200 through CKT 250 (BLK). With the park brake applied, the switch contacts close and the indicator illuminates.

The AUTO PARK indicator illuminates under the following conditions:

The indicator is grounded to G108 through CKT 451 (BLK/WHT). With the ignition switch in RUN or START, voltage is supplied to the park brake pull button switch and the park brake low pressure switch through CKT 639 (PNK). If the vehicle is in park, the park brake low pressure switch has closed contacts and voltage is supplied to the indicator through CKT 1844 (LT GRN). If the vehicle is not in park and the park brake pull button is not released, the circuit will be completed through CKT 909 (DK GRN), CKT 1131 (YEL/BLK), CKT 1929 (PNK/BLK) and CKT 1844 (LT GRN) and the indicator remains illuminated. This prompts the driver to release the auto apply brake.

The HIGH BEAM indicator alerts the driver that the headlamps are on high. The indicator is grounded to G108 through CKT 451 (BLK/WHT).

On vehicles not equipped with DRL, voltage is supplied to the indicator when the headlamps dimmer switch is placed in the high position. The indicator will illuminate.

On vehicles equipped with DRL, voltage is supplied to the DRL module through CKT 11 (LT GRN) when the headlamps dimmer switch is placed in the high position. The DRL module then supplies voltage to the indicator through CKT 629 (WHT) and the indicator is illuminated.

Voltage for the turn indicators is from the TURN B/U fuse through the turn signal lamps flasher on CKT 141 (BRN) and CKT 16 (PPL) when the ignition switch is in the RUN position. The indicators are grounded to G108 through CKT 451 (BLK/WHT). When the turn signal switch is activated, voltage is supplied directly to the indicators and the indicators illuminate.

Voltage for the seat belt indicator is supplied by the alarm module. The indicator is grounded to G108 through CKT 451 (BLK/WHT). When the ignition switch is in the RUN or START position the alarm module supplies ignition voltage to the indicator from the seat belt telltale output. The indicator will illuminate for set period of time.

Voltage for the illumination lamps comes from the INSTR LPS fuse through CKT 8 (GRY) with the headlamps switch in the park or headlamp position. The illumination lamps are grounded to G108 through CKT 451(BLK/WHT).