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The LCD display in the instrument panel is dimmed by the photocell and electronics in the Central Control Module (CCM) first.  If the photocell is dark, then the CCM looks at the input from the dimmer rheostat on the headlight switch.  The photocell brightness always overrides the dimmer rheostat on the headlight switch.  Warning bulbs in the trop monitor are never dimmed.  The other displays and panel bulbs and courtesy light are dimmed solely by the dimmer rheostat on the headlight switch. Note:  Test with the car out in the bright sunlight.  The light in the garage isn’t enough to...

Note:  This specifically addresses the issue that the cluster is dark.  If the issue with your cluster is bright, just not readable, see the Polarizing Film kit here.    The short answer is...it depends.  It depends on whether the headlight switch is off or on.  It depends on how the headlight brightness control on the headlight switch is set.  It depends on whether it's day or night.  It depends on whether you're testing inside the garage, or outside in the sunlight.  It depends on the weather.  Really.    The photocell can override the headlight dimmer, even when the headlight switch...

Before starting this test, make sure the battery is charged, that all fuses are good, and that the cluster is connected to the wiring harness connector. 1)  Turn the key on (engine off).  What should happen at this point is the four illumination bulbs should light up full brightness, and all segments on the cluster should turn on.  After the first two seconds, the display should resolve into 0MPH/0RPM.  After that, the cluster starts responding to light from the photocell.  If the cluster is somewhere dark, the brightness may decrease.  If you're out in sunlit conditions, it should remain full...

I get this question quite a bit - Does My 84-89 Cluster have Cruise Control?  Here's how to tell:1)  Remove the five screws holding on the back.  They're 7/32".2)  Remove the back.3)  Look at the space to the left of the power supply.  The power supply is the small board mounted to the top board in the upper right corner, near the 12 pin connector that connects the top and bottom boards.  If the components in this area are populated, your cluster has the cruise option.  If not, your cluster does not support cruise.Below are photos of this area: The...