Analog

The Analog Instrument Cluster consists of Fuel, Temperature, Speedometer and Tachometer Gauges. The Fuel and Temperature Gauges consist of three primary coils, one of which is wound at 90 degrees to the other two. The coils form a magnetic field which varies in direction according to a variable sender resistor connected between two of the coils. A magnet, to which a shaft and pointer are attached, rotates to align with the magnetic field. This results in the pointer position being relative to the output of the sender. The Tachometer consists of one coil connected between the Battery and the Ignition Coil. The electronic analog speedometer uses a printed circuit board powered by Battery voltage to convert the signal from the Vehicle Speed Sensor into a speed indication by means of a magnet inside two coil windings.

Analog Speedometer Assembly

The Speedometer Assembly includes the Speedometer, the Odometer and the Trip Odometer. All three are electronically controlled by a solid-state device that uses an input signal from the Vehicle Speed Sensor. The Speedometer Assembly (-17255-) is serviceable only as a unit.

Fuel Gauge and Sender

The Fuel Gauge Sender has three pins: one pin is grounded and the other two pins provide two different resistance outputs. One of these outputs of the Fuel Gauge Sender provides a resistance to the magnetic Fuel Gauge through a Fuel Anti-Slosh circuit. The magnetic Fuel Gauge controls pointer position based on this resistance. This resistance is approximately 145 to 155 ohms when the fuel tank is full and approximately 10 to 22 ohms when the fuel tank is empty.

The other output of the Fuel Sender provides a resistance to the Trip Minder Interface circuit. This resistance is approximately 10 ohms when the fuel tank is full and approximately 155 ohms when the fuel tank is empty.

Combination Fuel Anti-Slosh/Trip Minder Interface Module

The Combination Fuel Anti-Slosh/Trip Minder Interface Module contains two distinct circuits. The Fuel Anti-Slosh circuit provides a delay to the Fuel Gauge to prevent the Fuel Gauge pointer from fluctuating as a result of excessive movement in the fuel tank during certain vehicle maneuvers. The Trip Minder Interface circuit provides the provides the proper fuel level signal to the Trip Minder for use in the Distance-to-Empty function.

The Combination Fuel Anti-Slosh/Trip Minder Interface Module is used in conjunction with a special three-pin sender. The Fuel Anti-Slosh circuit and Fuel Gauge use one-half of the Fuel Gauge Sender, while the Trip Minder Interface circuit uses the other half. The input to the Fuel Anti-Slosh circuit is a resistance that varies between 10 ohms at empty and 155 ohms at full. The input to the Trip Minder Interface circuit at the 205 (DB/LG) wire is a voltage that varies between 3.5 volts at full and 0.4 volts at empty.

Temperature Gauge and Sender

The magnetic Temperature Gauge controls pointer position based on the resistance of the Coolant Temperature Sender. The Sender provides 74 ohms of resistance when the engine coolant is cold and 9.7 ohms when the engine coolant is hot.

Tachometer

The Tachometer consists of two coils that are wound 90~ apart. An electric current energizes the coils as required to move the pointer across the face. The Tachometer receives voltage pulses from the negative side of the ignition coil when the engine is running.

The Tachometer indicates engine speed in revolutions per minute (RPM).