Bob, been there, done that, got the T-shirt. I went back to incandescents bulbs when I couldn't get enough light into the prisms. I tried LEDs from the top shining down. I tried LEDs at the bottom of the cluster shining upward. Good old incandescents seem to still work the best. At least on the 126 models.

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)