The indicator lamp works fine - I kept the standard wattage bulbs, but went with the 78150 +30 premiums (refocused filament and a trace of Xenon gas) from Hella ( http://catalog.com/susq/hella/bulbs.htm ). Since the wattage didn't change, the warning light isn't "confused". Also, since they are the same wattage, the wiring did not need to be redone. I will probably redo the wiring with relays at some point as thicker wire/relays will allow more current flow to the bulbs, allowing them to run at maximum efficiency.
I have had the Euro lights for almost a year, no trouble with the stock wiring or indicator light when using stock wattage bulbs. I also will be trying the Phillips Vision Plus +50 bulbs from Europe http://www.fosmo.com/ and don't anticipate any problems. Good luck!

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E