At least with a MBZ temp gauge, we know it's alive!

Compare that to a typical japanese temp gauge that reaches operating temp and then never moves!

Another data point, my car would always run cool and in hindsight this was telling me my thermostat was ailing. It finally broke shut and I overheated. I don't remember if it was a Wahler but the failure was the same as mentioned, a broken bridge.

glenmore
1991 300CE
1990 LS400