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Fuse for the instrument cluster light is #16 last time I checked. Remember that the power for the lights is routed from the rheostat via a grey wire and then it goes to each one of the 3 bulbs to light up the cluster. The metal holders the bulbs are in provide the ground to complete the circuit. I believe there is also a grounding strap for the dash behind the clock. This should just add some extra grounding for the dash because I believe the dash grounds itself when it is mounted but I could be wrong. I would think either the rheostat failed or one of the wires fell off. I would not be impossible that all three lights burned out but rare. Good Luck!
Sincerely,
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Julio Meza 1979 264GL B27F 122K Features Added: BW55 To M46, Central Locking System, 25mm IPD Front Sway Bar, 81+ Dash W/ Oil & Ambient Temp Gauges In C, Oil Pressure, Volts b> Next Project: +Cruise Control
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