The dash lights have never been great for the 1800E/ES.
This is because the light from the bulbs has to be reflected around the perimeter of the faces and if the reflective paint on the inside of the housing is dirty or flaking, it will be dim.
So LEDs are the way to go.
IIRC, you want LEDs with a wide angle of light dispersion.
The only problem can be if you get LEDs that are too bright. You can't dim standard LEDs with the stock dimmer.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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