The standard instrument cluster contains a microprocessor. The instrument cluster micro processor communicates with other modules in the vehicle over the Class 2 serial data line. The information passed over the Class 2 serial data line, along with dedicated circuits to specific sensors and modules, provides the inputs which are used to operate all the gauges, indicators and the message center in the cluster. The instrument cluster continuously processes class 2 serial data in order to determine the correct values and states to display.

When replacing instrument panel cluster assembly, federal law requires that the odometer reading of the replacement unit be set to register the same mileage as the prior odometer. If the same mileage cannot be set, the law requires that the replacement odometer be set at zero and a label be installed on the drivers door frame to show the previous odometer reading and the date of replacement.

The instrument cluster includes the following components: