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I just use a Sharpie marker on the speedo glass for trip meter. Simple, cheap, effective and reliable.
Hmm, so simple. I guess it just wipes off? I'll have to try that.
Alcohol eyeglass cleaning wipes or a shot of brake cleaner on a paper towel will remove the Sharpie in short order. If on the road and you run out of room on the glass bezel scribble the Sharpie over the old marks and wipe away before it dries.
Wonder if a "dry erase" marker would work?