Checking the EPC for shifter gate lighting, it appears that '81 thru '85 has the fiber optic system. '86 on, seems to be with a separate bulb. Checked several model #'s and that scenario was true for the ones checked. So, Mike and RSH are both right. Dave, the EPC shows your 1987 420 SEL to have a bulb at the shift gate. Hope it's right

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)