GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Instrument Cluster

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See Figures 1, 2 and 3

REMOVAL & INSTALLATION




CAUTION
Do not attempt any service on the steering wheel, column or instrument panel on Buick and Oldsmobile models equipped with an air bag. Service on these models should only be performed by a professional technician.

Oldsmobile Models
  1. Disconnect the negative battery cable. Slide the steering column collar up the column. Then, unsnap the steering column trim cover by pulling to the rear. Remove it.
  2.  
  3. Remove the screws attaching the gauge cluster to the carrier.
  4.  
  5. Pull the gauge cluster rearward just far enough to gain access behind it. Disconnect the gauge wiring connectors and two lamp sockets from the rear of the cluster. Remove the cluster.
  6.  
  7. Remove the screws attaching the gauge housing to the cluster. Then, remove the nuts attaching the back of the gauges to the gauge housing and remove the gauges.
  8.  

To install:
  1. Connect the gauge wiring connectors and two lamp sockets at the rear of the cluster.
  2.  
  3. Install the gauge cluster and nuts attaching the back of the gauges to the gauge housing. Install the screws attaching the gauge housing to the cluster.
  4.  
  5. Install the four screws attaching the gauge cluster to the left side trim cover.
  6.  
  7. Snap the steering column trim cover into place. Connect the negative battery cable and check operation.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Oldsmobile left side trim cover; others similar



Click image to see an enlarged view

Fig. Fig. 2: Instrument cluster removal; all models similar

Pontiac Safari Wagons and Parisienne
  1. Disconnect the negative battery cable. Remove the four screws securing the lower cover to the steering column and then remove the cover.
  2.  
  3. Remove the shift indicator cable from the column.
  4.  
  5. Remove the two mounting bolts attaching the column to the lower side of the dash panel from underneath. Then, lower the column carefully until the steering wheel rests on the seat.
  6.  
  7. Going around the perimeter of the plastic lens, remove the six screws and three snap-in plastic fasteners.
  8.  
  9. Remove the two screws from the upper surface of the gray sheet metal trim plate. Then remove the nuts from the two studs in the lower corner of the cluster.
  10.  
  11. Pull the cluster out just far enough for access to it from the rear. Reach behind the cluster and disconnect the speedometer cable by turning the collar until it unscrews. Then, pull it out of the dash panel.
  12.  

To install:
  1. Push the cluster in just far enough for access to it from the rear. Reach behind the cluster and connect the speedometer cable by turning the collar until it engages.
  2.  
  3. Install the two screws from the upper surface of the gray sheet metal trim plate. Then install the nuts from the two studs in the lower corner of the cluster.
  4.  
  5. Going around the perimeter of the plastic lens, install the six screws and three snap-in plastic fasteners.
  6.  
  7. Install the two mounting bolts attaching the column to the lower side of the dash panel from underneath.
  8.  
  9. Install the shift indicator cable to the column.
  10.  
  11. Remove the four screws securing the lower cover to the steering column and then remove the cover. Connect the negative battery cable and check operation.
  12.  

Buick Sedans

CAUTION
Do not attempt any service on the steering wheel, column or instrument panel on Buick and Oldsmobile models equipped with an air bag. Service on these models should only be performed by a professional technician.

ANALOG CLUSTER
  1. Disconnect the battery negative cable. Remove the left side trim cover.
  2.  
  3. Remove the four screws which fasten the cluster carrier to the instrument panel.
  4.  
  5. Look under the vehicle to see if the speedometer cable is of the two-piece design. If it is, disconnect the cable at the transmission end (this will give slack for later work).
  6.  
  7. Remove the steering column trim cover. Disconnect the clip which fastens the shift indicator in place.
  8.  
  9. Remove the two bolts that fasten the steering column to the dash panel and lower it onto the front seat.
  10.  
  11. Pull the cluster far enough out of the dash panel so that you can disconnect the speedometer cable and bulbs at the rear of the cluster.
  12.  
  13. Securely apply the parking brake or block the wheels. Pull the gear selector lever down into low gear. Pull the instrument cluster out far enough to remove the single screw which fastens the Speed Sensor optic head to the speedometer and then remove the cluster.
  14.  

To install:
  1. Securely apply the parking brake or block the wheels. Pull the gear selector lever down into low gear. Push the instrument cluster in far enough to install the single screw which fastens the Speed Sensor optic head to the speedometer.
  2.  
  3. Push the cluster far enough into the dash panel so that you can connect the speedometer cable and bulbs at the rear of the cluster.
  4.  
  5. Install the two bolts that fasten the steering column to the dash panel.
  6.  
  7. Install the steering column trim cover. Connect the clip which fastens the shift indicator in place.
  8.  
  9. Connect the cable at the transmission end, if removed.
  10.  
  11. Install the four screws which fasten the cluster carrier to the instrument panel.
  12.  
  13. Connect the battery negative cable. Install the left side trim cover.
  14.  

Buick Sedans
DIGITAL CLUSTER

WARNING
When handling electronic components, avoid touching the electrical terminals of these parts. Always touch a known good ground before handling the part and more frequently after sliding across the seat or sitting down from a standing or walking position. Failure to do so can result in component damage and failure.

  1. Disconnect the battery negative cable. Follow all the steps in the procedure above. Disconnect the harness connector and the ground strap at the back of the instrument carrier and then pull the entire unit out.
  2.  
  3. Unscrew the trip set lever knob. Remove the four screws from the corners of the clear cluster lens. Then, remove the lens and back filler.
  4.  
  5. Remove the spring and needle assembly from the shift indicator.
  6.  
  7. Remove the five screws fastening the tube and circuit board assembly to the cluster carrier. Then, lift the assembly out of the carrier, noting the position of the gasket which covers each of the indicator lights.
  8.  
  9. Hold the speedometer frame against the tube and circuit board face plate and remove the two standard head screws from the face plate. The mechanical odometer may now be removed, as necessary.
  10.  

To install:
  1. Hold the speedometer frame against the tube and circuit board face plate and install the two standard head screws to the face plate. The mechanical odometer may now be installed, as necessary.
  2.  
  3. Install the five screws fastening the tube and circuit board assembly to the cluster carrier.
  4.  
  5. Install the spring and needle assembly to the shift indicator.
  6.  
  7. Install the four screws into the corners of the clear cluster lens. Screw in the trip set lever knob.
  8.  
  9. Connect the battery negative cable and check operation.
  10.  

Buick Estate Wagons

Instead of an instrument cluster, this dash uses two separate gauge units; a speedometer on the left and a fuel gauge on the right. Removal is similar for the two units. Follow the parts of the procedure specified, depending upon which you need to service.

  1. Disconnect the battery negative cable. Remove the left side trim cover.
  2.  
  3. Remove the four screws attaching the gauge unit you want to remove to the dash. If removing the speedometer, disconnect the cable at the transmission or cruise control transducer (under the hood).
  4.  
  5. Pull the unit out far enough to disconnect parts described below.
  6.  

Speedometer:


Two rear light bulb sockets by rotating to release and pulling them out.
 
The speedometer cable by depressing the retaining clip while pulling the cable back.
 
The VSS optic head by removing the single screw retaining it in place.
 

Fuel gauge:


Two rear light bulb sockets by rotating to release and pulling them out.
 
The electrical connector.
 

  1. Slide the unit out of the dash.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: Estate wagon gauge cluster

 
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