Chevrolet Full-size Cars 1968-1978 Repair Guide

Instrument Cluster

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REMOVAL & INSTALLATION



1968 Models


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Fig. Fig. 1 When removing interior components, screws may be hidden under an overhang, or behind a cap



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Fig. Fig. 2 Instrument cluster mounting on 1968 models



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Fig. Fig. 3 Instrument cluster components on 1968 models

Before removing any instrument cluster, check to see if any light bulbs are burned out. If so, note their positions and replace them as soon as the cluster is removed. Replacement is much easier with the cluster removed than with it installed.

  1. Disconnect the negative battery cable.
  2.  
  3. Carefully unplug forward wiring harness from the fuse panel and remove panel from firewall.
  4.  
  5. Remove the screws retaining the gauge cluster to instrument panel.
  6.  
  7. From the mast jacket, remove the screws retaining the column-mounted automatic transmission pointer cable.
  8.  
  9. From behind the cluster, disconnect the speedometer cable, harness connector, clock, speed warning device, defogger, convertible top or tailgate switches and vacuum hoses, if so equipped. If equipped with gauge pack, disconnect the oil pressure line.
  10.  
  11. Using care to prevent scratching the mast jacket, tip the top of the cluster forward and remove it from the vehicle.
  12.  

To install:

  1. Carefully position the cluster close to the wiring and cables and connect it.
  2.  
  3. Double check to make sure that every wire disconnected is in the proper position.
  4.  
  5. Connect the transmission pointer cable and install the cluster to the instrument panel.
  6.  
  7. Connect the fuse panel to the firewall and plug in the forward wiring harness.
  8.  
  9. Connect the negative battery cable and check to make sure that all bulbs, gauges and switches affected by the removal are working properly.
  10.  

1969 Models
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the glove box and air conditioning center dash outlet.
  4.  
  5. Remove the four screws above the instruments and gently pull instrument panel pad loose from dash clips.
  6.  
  7. If equipped with air conditioning, remove the lap cooler from under the steering column.
  8.  
  9. Remove the three cluster mounting bolts from the underside of the dash.
  10.  
  11. Disconnect the shift indicator cable wire on the steering column.
  12.  
  13. Disconnect the radio wiring.
  14.  
  15. Loosen, but do not remove, the steering column mounting bolts and lower the steering column onto the front seat.
  16.  
  17. Remove the instrument panel top attaching screws and gently lift and tilt the panel forward.
  18.  
  19. Disconnect and tag the speedometer cable (press snap retainer) and all electrical connections.
  20.  
  21. Remove the six top illumination can attaching screws.
  22.  
  23. Remove the indicator bulb bezel by pushing in on the right-side of each cover to expose the screws, then remove the bezel retainer screws (4).
  24.  
  25. Remove the rear cluster to carrier attaching screws and remove the cluster.
  26.  

To install:

  1. Position the cluster in the instrument panel and install the rear cluster to carrier screws.
  2.  
  3. Push in on the illumination bulb bezel and install the bezel retainer and screws.
  4.  
  5. Install the six top illumination can attaching screws.
  6.  
  7. Carefully slide the cluster inwards and connect all wiring and the speedometer cable. Double check to make sure that everything is connected properly.
  8.  
  9. Install the six top instrument panel attaching screws.
  10.  
  11. Lift the steering column up and tighten the mounting bolts.
  12.  
  13. Connect the radio wiring and shifter indicator cable.
  14.  
  15. Install the three lower cluster mounting bolts and lap cooler duct.
  16.  
  17. Install the instrument panel pad in the dash clips and then install the top four pad mounting bolts.
  18.  
  19. Install the air conditioning center outlet and glove box.
  20.  
  21. Connect the negative battery cable and check to make sure that all instruments and lights are functioning properly.
  22.  

1970 Models


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Fig. Fig. 4 Dash pad mounting on 1970 models



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Fig. Fig. 5 Instrument cluster mounting on 1970 models

  1. Disconnect the battery ground cable.
  2.  
  3. Remove the air conditioning lap cooler under the steering column.
  4.  
  5. Remove the steering column mounting bolts. Lower and support the steering column.
  6.  
  7. Remove the dash pad and if applicable, disconnect the center air conditioning outlet hose.
  8.  
  9. Disconnect the shift indicator cable on the steering column and remove the indicator bulb bezel.
  10.  
  11. Remove shift indicator lamp housing.
  12.  
  13. Remove the radio, as required.
  14.  
  15. Remove the instrument panel trim plate. The plate is held in place with snap-in studs on the left-side, right-side and to the right of the steering column. You can use a hooked tool to pull the trim plate free.
  16.  
  17. Remove the air conditioner/heater control assembly.
  18.  
  19. Remove the lower instrument cluster-to-bracket and parking brake pedal bracket screws.
  20.  
  21. Remove the ash tray and its retaining bracket.
  22.  
  23. Remove the three screws at the top of the instrument cluster and tilt the cluster forward.
  24.  
  25. Disconnect and tag the speedometer cable and instrument wiring harness. The illumination cover must be removed to get at the wiring.
  26.  
  27. Remove the instrument cluster.
  28.  

To install:

  1. Position the cluster close to the wiring and connect the speedometer cable and wiring harness to the cluster.
  2.  
  3. Install the illumination cover after connecting the wiring.
  4.  
  5. Install the top three instrument cluster mounting screws.
  6.  
  7. Install the ash tray and retaining bracket.
  8.  
  9. Install the lower instrument cluster mounting screws and then the parking brake pedal bracket.
  10.  
  11. Install the heater/air conditioner control assembly.
  12.  
  13. Install the instrument panel trim plate into the snap in studs.
  14.  
  15. Install the radio, shift indicator housing and indicator cable.
  16.  
  17. Install the center air conditioning outlet and dash pad.
  18.  
  19. Install the steering column into the mounting bracket and tighten the bolts.
  20.  
  21. Install the center lap cooler on vehicles with air conditioning.
  22.  
  23. Connect the negative battery cable and check that all instrument and lights are working correctly.
  24.  

1971-76 Models


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Fig. Fig. 6 Exploded view of the instrument panel components on 1972 models

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cigar lighter knob and then the screw under it.
  4.  
  5. Pull out the headlight switch and remove screw in middle of shaft.
  6.  
  7. Remove the two screws in the lower corners and remove the shroud.
  8.  
  9. Remove the clock stem set screw and knob.
  10.  
  11. Remove the instrument cluster lens and retaining strip. There are three screws holding the lens retaining strip.
  12.  
  13. Tilt the filter housing back and remove it.
  14.  
  15. The speedometer, fuel gauge, or clock may now be removed.
  16.  

To install:

  1. Replace the necessary gauge(s) and reinstall the filter housing.
  2.  
  3. Install the lens and retaining strip.
  4.  
  5. Install the clock stem knob and set screw.
  6.  


WARNING
The set screw for the clock stem must not be over tightened. The stem is very small and can break very easily requiring the clock to be replaced.

  1. Install the shroud and the two lower corner mounting screws.
  2.  
  3. Install the headlight switch and the screw in the middle of the shaft.
  4.  
  5. Install the cigar lighter knob and screw.
  6.  
  7. Connect the negative battery cable and check the all lights and instruments affected are functioning properly.
  8.  

1977-78 Models


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Fig. Fig. 7 Instrument cluster mounting on 1977-78 vehicles



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Fig. Fig. 8 Instrument panel cluster assembly for 1977-78 vehicles

  1. Disconnect the negative battery cable. Remove the steering column lower cover screw and remove the cover.
  2.  
  3. Disconnect the shift indicator cable from the steering column.
  4.  
  5. As required, remove the two screws mounting the steering column. Lower the steering column onto the front seat. Make sure that the column is adequately supported on the seat.
  6.  

On vehicles equipped with tilt steering wheel it may be possible to position the wheel in the full down detent in order to remove the cluster assembly from the vehicle.

  1. Remove the six screws and three snap-in fasteners from around the edge of the instrument cluster lens.
  2.  
  3. Remove two screws from the sheet metal trim plate, then remove the two nuts from the studs at the lower corner of the cluster.
  4.  
  5. Reach up behind the cluster and disconnect the speedometer cable, then remove the cluster by pulling outwards on it.
  6.  

To install:

  1. Slide the cluster inwards enough to connect the wiring and speedometer cable to the rear of the cluster.
  2.  
  3. Install the two mounting nuts on the lower corner of the cluster, then install the trim plate and screws.
  4.  
  5. Install the lens over the cluster, then install the six screws and three snap-in fasteners around the edge of the cluster.
  6.  
  7. As required, raise the steering column and install the mounting bolts.
  8.  
  9. Connect the shifter indicator cable at the steering column.
  10.  
  11. Install the steering column lower cover and connect the negative battery cable.
  12.  
  13. Check that all of the lights and gauges work correctly.
  14.  

 
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