It also means that, as long as the gauge is pinned high (and therefore the needle is not moving) you're OK. Should you see the needle move (other than hot idle) you want to pay attention and react quickly. A blinky red light and/or buzzer would be even better (we've discussed such a mod before).

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970