If I remember correctly the new lights from that kit are lower wattage than the stock ones (maybe they were the same). Seems like they shouldn't really get any hotter (but I'm no lighting expert). I haven't had any problems yet, but it's only been a couple of weeks. I'm going to pull the cluster again to repaint the needles soon, so I'll check for any evidence of overheating in there.

Speaking of the electric vs. "mechanical" oil gauge... I thought the 123's had mechanical speedos, but mine just has a screw-in, one-pronged electric plug...?

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)