RAM 2500 Truck 2WD V8-5.7L (2008)
Speedometer Head: Description and Operation
Description
DESCRIPTION
A speedometer is standard equipment on all instrument clusters. The speedometer is located next to the tachometer, just to the right of center in the
instrument cluster. The speedometer consists of a movable gauge needle or pointer controlled by the instrument cluster circuitry and a fixed 210 degree
primary scale on the gauge dial face.
The speedometer reads left-to-right either from 0 to 120 mph, or from 0 to 200 km/h, depending upon the market for which the vehicle is
manufactured. Each version also has a secondary inner scale on the gauge dial face that provides the equivalent opposite units from the primary scale.
Text appearing on the cluster overlay just below the hub of the speedometer needle abbreviates the unit of measure for the primary scale (either MPH or
km/h ), followed by the unit of measure for the secondary scale.
The speedometer graphics are black (primary scale) and blue (secondary scale) against a white field making them clearly visible within the instrument
cluster in daylight. When illuminated from behind by the panel lamps dimmer controlled cluster general illumination lighting with the exterior lamps
turned ON, the black graphics appear blue-green and the blue graphics appear light blue. The gauge needle has internal optical illumination. Gauge
illumination is provided by replaceable incandescent bulb and holder units located on the instrument cluster electronic circuit board.
The speedometer is serviced as a unit with the instrument cluster.