1987 / 1988 Tach LCD Light DiffuserDiffusers broken or melted? Ours aren't! These clear plastic panels act as a light pipe, carrying light from the bulbs to the information areas of the LCDs. Unfortunately, the factory bulbs generate too much heat, and eventually melt the diffusers in the area where they surround the bulbs. Melted, bubbled or discolored diffusers can result in an image that's half as bright as one with proper, clear diffusers! It's also common for the small mounting

The results are the tachometer or other analog gauge reads significantly higher or lower than they should be

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High Pitch Whine is common due to a failed switchmode inductor

but works normally when the headlights are on

test and repair tips

You've recently replaced the cruise solenoid

Note:  As of 9/2020

Another common symptom is that the tachometer pegs 6

This is a new warning lens from a 1988 Drivers Information Center Panel

Turn-On Circuit (4

Note: This will not work on a 1984

the switches are probably bad as well